When it comes to STAR WARS. there's just no way to ever find the answers to the whole story. I know it's corny, but right out of the gate, with the sacred Original Trilogy, we're treated to Ben's "the truths we cling to depend on our point of view." So, really, any spin on any thing in STAR WARS is not only possible, but plausible. In that view, yeah ... why not? Have Windu's view's change due to what he saw, or something to that effect. But still ...
It's in the final thing that Annie informed Mace, before hand, that Palpatine - Annie's own, personal friend and mentor - was, in fact, "the Sith Lord we've been looking for." What's more, when the Chancellor gets threatened by Mace, initially, Palpatine spells it out, for him, he says, "... I am the Senate." To which Windu's all like, "... not yet." What does Mace want ... a Formal Letter to finally, kind of, like, "get it"? I mean ... Palpatine's been acting so suspicious that Mace has him spied on, before any of this. Annie tells him flat out that Palpatine's the Sith. And now, Palpatine's verbally confirming it. And Mace's all, like, "No, you're NOT!!!" for NO reason. I mean .... any way you want to slice it, Palpatine's killing the nameless extras didn't tell Windu anything he didn't already know ...
It's in the final thing that Annie informed Mace, before hand, that Palpatine - Annie's own, personal friend and mentor - was, in fact, "the Sith Lord we've been looking for." What's more, when the Chancellor gets threatened by Mace, initially, Palpatine spells it out, for him, he says, "... I am the Senate." To which Windu's all like, "... not yet." What does Mace want ... a Formal Letter to finally, kind of, like, "get it"? I mean ... Palpatine's been acting so suspicious that Mace has him spied on, before any of this. Annie tells him flat out that Palpatine's the Sith. And now, Palpatine's verbally confirming it. And Mace's all, like, "No, you're NOT!!!" for NO reason. I mean .... any way you want to slice it, Palpatine's killing the nameless extras didn't tell Windu anything he didn't already know ...