Quote Originally Posted by Kraco
Kenpachi wasn't fighting Ichigo to destroy him. He only wanted a good fight and thus he scaled his own power use appropriately. At what point did the Kenpachi-Ichigo fight look like Kenpachi would be going all out? Perhaps at the very end when he released all his reiatsu you could say he did go all out but only in a manner of speaking. If Kenpachi really had wanted to defeat Ichigo, there wouldn't even have been a fight in the first place because our favorite orange head would have been dead before he knew what hit him.

The Ichigo-Byakuya fight certainly was more complicated. It's hard to say how it would have ended if Byakuya hadn't grossly underestimated Ichigo. But as it is, that's also a mistake and weakness of course. But on the other hand, he wouldn't be underestimating the Arrancar and would probably go straight for a kill unlike pretty much all the other people.
At what part did kenpachi go all out on ichigo? Idk, maybe the part where kenpachi says, "ichigo, im taking off the eye-patch and going all out"?

Byakuya may have underestimated ichigo the first time he had a sword right next to his throat, and arguably the 2nd time he had ichi's sword next to his throat, but after they both went bankai and ichigo put up a huge fight, i really doubt byakuya was holding back or underestimating ichigo when he tried to do his finishing white-glow move.