User blog comment:OtakuWeekly/Blog Game Idea?/@comment-24769684-20150325111330

I would say Shanks.

He fought on par with Whitebeard, but unlike Whitebeard doesn't require tubes for survival. He's young and strong.

As for Rayleigh, eh, we have seen him fight on par against an admiral but he doesn't seem to have had much practice nowadays.