Gaspard is not sympathetic, period. Outside his romantic notion of honor, he's pretty stone cold.
...and this disagrees with me how? Or is this even a disagreement?
I think it's her opportunity to be more than a political player. If it was her choice, she'd be probably something like Jefferson.. educated, enlightened, but takes his sweet time with real reforms. It's why Briala breaks away. Now it's her opportunity to be more. Or not....
Gaspard will always be what he is though, I think.
Briala breaks away from Celene because everyone in the chamber knows that Celene won't keep any agreement or promise of reform when it becomes too inconvenient. She'll do it at her own pace, but roll it back as well for her advantage, and realizing this lack of conviction is part of what makes Briala revolt.
Which was really not smart because that moment, in which Briala had the keys of influence and could prevent the war and still have leverage over Celene afterwards, was the best reliable moment for Briala to make a bargain from a position of strength. If she sides with Celene in the future, she's undercut herself and her efforts with the animosity acrued by elves prolonging the war, even as Celene by necessity works to adjust her power base to being resistant to, rather than dependent on, the mirrors.
Briala's concerns about Celene don't get any better if she strikes a deal later. The only partner whose honor in any such deal wouldn't be doubted is Gaspard, but Briala is open about fighting him as well depending on who has the upper hand.
I suppose that's where the Inquisition comes in.
Eh, the Inquisition might end the fade tears but it's not going to do much about Nevarra or other threats on Thedas.