No he wasn't. He started off as the most generic of the scabbards, became a bad guy with an interesting backstory, and then continued to be incredibly generic.
The anime did a better job of fleshing him out than the manga.
One Piece is a cliche series.
Yeah, but I do feel like they are very well drawn. Its just that some of them could be more fleshed out still, or haven't really gotten their due(Namely Kyoshiro and Kawamatsu).
The others like Raizo(fighting Fuku), Kinemon, Kiku, Ashura, Neko, Inu and even Izo(who has had a lot of nice interactions with Kiku), have had some really fleshed out stuff.
Kyoshiro and Kawamatsu need one stand out moment to really make them worthwhile additions to the raid. Kyoshiro had promise at the beginning, but hasn't done much since.