Enyalus
But that proves exactly nothing because Windu had not submersed himself in Vaapad yet.
Enyalus
In a 1 v 1 fight where Mace knows he's going to face Sidious in a battle, I'd like to see you prove that he couldn't just instantly sink into Vaapad.
👆
I rest my case, counselor. Or is it your case, since you seem to be making it for me?
Enyalus
In continuity, Mace has already fully submerged himself in Vaapad. If they fight again in a forum battle, he knows how to give himself over again. Meaning that he can and will enter Vaapad instantly, as he does later in the duel (twice, really.)
He didn't know how to fully enter Vaapad before, then? Seems like if you don't know how to do something, you're not going to do it at all. More accurately, he knew how to, but it was a process that took time, effort, and concentration.
In any case, you'd have to prove or have indicated that the Mace Windu in question during these hypothetical scenarios is specifically from the second segment of the fight with Palpatine, prior to his death. Because 'RotS Windu' doesn't sound like 'Mace Windu as of the two minute mark in his fight with Sidious; the moment when he knows exactly how to enter Vaapad foreverrrr!'