Hollow Ichigo would win without too many problems.
@PrinceAragorn1: How is Nnoitra weaker than Grimmjow? Nnoitra would destroy Grimmjow. And tje battle could had lasted 1 minute but like always, Kenpachi loves to drag a fight... same with the Ichigo one... he could had one shoted Ichigo... killed him and becoming the main character with ease... but it was all plot work so Ichigo to beat Kenpachi.
Ichigo needs PIS/CIS to beat Kenpachi cause he can't.
How can you say that? Nnoitora didn't fight either ichigo or grimmjow at their prime. Even his follower was beating up ichigo, showing how weakened he was. Kenpachi could have one shotted ichigo once. But not once he became stronger. It's like saying frieza could have one-shotted goku. He got stronger, and kenpachi lost. That's truth.
And this is hollow ichigo we are talking about. A ban kai ichigo would be better than kenpachi. Hollow ichigo is too much for him.