User blog comment:Woohoot/Of Shichibukais and pirate crews/@comment-24799733-20140515120928

I think that any super strong character that's not on the side of the WG can be considered a candidate for Shichibukai..

But about the crews... it really is mysterious. I think Mihawk possibly was on a crew. Remember how Whitebeard said that everyone knew of the clashes between Mihawk and Shanks... So I doubt that Mihawk just roamed around the world looking for fights, doesn't seem like him.

Kuma, well he... I just can't understand him..

Crocodile, out of all you mentioned he was most probably the Captain of a crew before forming Baroque Works..