I might not have understood your middle paragraph perfectly, but here I go: So these are just my feelings, of course, but I actually think him being rank and file might be the reason why the idea of a second army being out there is personal enough for him to make him step on Niner's toes? Like, running with the Nulls I think also made him kneejerk lock on to this kind of thing, since it's in their wheelhouse, and made him more immediately aware that this isn't good news - their influence is why he's able to jump straight past "Yay, reinforcements!" and into alarm.
But I also feel like, for Corr, this was always going to be more personal, because it's the Troopers like him, for reasons of sheer numbers and also being last in line for anything and everything, who are feeling the lack of support the hardest. Who are dying quickest and in the greatest number. Like Maze says when Ordo asks if he's capable of recognizing the injustice of his situation, "You're damn right I do." When they're the ones dying all over the places, I don't think even the line troopers are exempt from the dawning realization that shit's fucked up. They just have their Kamino conditioning - to a far, far greater degree than the RC's or ARC's - that tell them complaining openly about these things to outsiders isn't safe or productive. They probably keep it to themselves. Which just exacerbates the "poor dumb sheep" impression people like Skirata have of them, except for "exceptions" who have been "saved" like Corr.
Hearing there are reinforcements out there, or reinforcements who might be coming, or worse, that they exist and aren't being used is one of those things that - I feel - would just arrow in on a lot of that anger Corr has that we catch glimpses of under the surface (if his sense of humor is any guide, anyway. It tends to be very wry and jaded, and he's quick to dismiss it when anyone takes him seriously, but we sometimes catch glimpses of a real fury there that he keeps hidden under the cinders. It's just a surprise when it actually ignites fast enough to flash past the more flippant exterior he presents.)
It's not that he - or any line trooper - doesn't have the mind (though they may lack context), it's that usually they seem to keep whatever they're thinking or feeling about a situation determinedly tucked away around outsiders because they've known their whole lives that who they are and what they think doesn't matter to anyone outside their own circle. Their opinion on what's happening to them has never been necessary. Corr's eased up on this after training with the Nulls, which I think is a factor to his barging over Niner, but even he's still not exempt from this, and even through O66 he seems to have kept that self-protective, perfect commodity, don't-rock-the-boat mask partially running. The mask the RC's say they can mimic but that the line troopers perfected. So because his mask is more perfect and automatic, him breaking through it to basically claw over Niner to get at this information has more weight, and I think it's because he was made as a line trooper and this is very personal for him.
...Uh, so, TL;DR, I do feel like the line troopers definitely have opinions about things happening to them, but that they're unlikely to ever actually voice those opinions even if directly asked unless they're very, very close to the person they're talking to, and feel safe.
Re: Corr
I might not have understood your middle paragraph perfectly, but here I go: So these are just my feelings, of course, but I actually think him being rank and file might be the reason why the idea of a second army being out there is personal enough for him to make him step on Niner's toes? Like, running with the Nulls I think also made him kneejerk lock on to this kind of thing, since it's in their wheelhouse, and made him more immediately aware that this isn't good news - their influence is why he's able to jump straight past "Yay, reinforcements!" and into alarm.
But I also feel like, for Corr, this was always going to be more personal, because it's the Troopers like him, for reasons of sheer numbers and also being last in line for anything and everything, who are feeling the lack of support the hardest. Who are dying quickest and in the greatest number. Like Maze says when Ordo asks if he's capable of recognizing the injustice of his situation, "You're damn right I do." When they're the ones dying all over the places, I don't think even the line troopers are exempt from the dawning realization that shit's fucked up. They just have their Kamino conditioning - to a far, far greater degree than the RC's or ARC's - that tell them complaining openly about these things to outsiders isn't safe or productive. They probably keep it to themselves. Which just exacerbates the "poor dumb sheep" impression people like Skirata have of them, except for "exceptions" who have been "saved" like Corr.
Hearing there are reinforcements out there, or reinforcements who might be coming, or worse, that they exist and aren't being used is one of those things that - I feel - would just arrow in on a lot of that anger Corr has that we catch glimpses of under the surface (if his sense of humor is any guide, anyway. It tends to be very wry and jaded, and he's quick to dismiss it when anyone takes him seriously, but we sometimes catch glimpses of a real fury there that he keeps hidden under the cinders. It's just a surprise when it actually ignites fast enough to flash past the more flippant exterior he presents.)
It's not that he - or any line trooper - doesn't have the mind (though they may lack context), it's that usually they seem to keep whatever they're thinking or feeling about a situation determinedly tucked away around outsiders because they've known their whole lives that who they are and what they think doesn't matter to anyone outside their own circle. Their opinion on what's happening to them has never been necessary. Corr's eased up on this after training with the Nulls, which I think is a factor to his barging over Niner, but even he's still not exempt from this, and even through O66 he seems to have kept that self-protective, perfect commodity, don't-rock-the-boat mask partially running. The mask the RC's say they can mimic but that the line troopers perfected. So because his mask is more perfect and automatic, him breaking through it to basically claw over Niner to get at this information has more weight, and I think it's because he was made as a line trooper and this is very personal for him.
...Uh, so, TL;DR, I do feel like the line troopers definitely have opinions about things happening to them, but that they're unlikely to ever actually voice those opinions even if directly asked unless they're very, very close to the person they're talking to, and feel safe.