Actually, when I read that, I interpreted it as Ulric essentially going, "Well, you tried to warn them, I will work so they see the error of their ways, and THEN we can do it correctly, like you guys want." I kinda think that he may have been a student of the Adders, and (weird Jantern Logic) being sort of a middle ground between Warden/Crusader. I think he may have supported conquering the Inner Sphere in private (which the party line was against), but essentially, for the Inner Sphere's own good. Almost like the Vipers, except a little saner, maybe?
I see your point. And Ulric's own motives and deeper thought processes are most certainly not known, except for what he chose to reveal.
My interpretation of Cassius N'Buta's speech in
Revival Trials was Ulric knew the Adder plan would in fact work well, and so he was glad to let it die because the Crusaders themselves didn't particularly like the Adders and so it would simply not happen if no one else stood up. Rule of Clan Cool. Because reasons ideological and a fundamental disagreement about the invasion.
But that's me. And of course I respect all takes because this matter is by no means fully defined.
edit:
For some reason, this is what immediately popped into my head when I read "Revival Trials."
I agree with that 110%.
That was what made me think Ulric would have felt bad for Cassius. Being laughed at, when N'Buta is one of the smartest people in the room literally.
Inwardly, at his very core, I think Ulric was really a nice guy who was not allowed to be nice at all due to the world into which he was born.