I feel like Kira had the beginnings of something interesting in Destiny with his aimless interventions into the war ultimately causing more harm than good. It might have even been meaningful had the show had the guts to actually kill him off in his fight with Shinn. But like, it doesn't work when afterwards Durandal just causally reveals himself as the obvious bad guy and makes stopping him really straightforward.
Durandal was doing the "just as planned" smile every other episode and dropping cryptic quotes left and right. He was voiced by Ikeda the same guy that voiced Char. He was literally playing chess in a dark room, for God's and Glenn's sake. He might as well just hold a giant neon sign that says "I am the designated scheming chessmaster antagonist of the show."
Like, the Destiny plan really did came out a too late, other than a few tiny hints of how he want people to "find their place" sprinkled earlier. Destiny really shoudl've get to the point faster and more obvious yeah, but Durandal being the bad guy really should not be a surprise.