Board Thread:Questions and Answers/@comment-10797017-20130624101208/@comment-11051098-20130708211144

Yeah, I don't know how Marenoshin Ômaeda was as a lieutenant, but I'm not impressed by Marechiyo. If he is anything like his father, Urahara would have made a much better lieutenant than him.

Other than Ômaeda, I don't know about any 3rd seats who could do a better job than the lieutenant. Judging by impression, I dunno about Ikkaku and Yachiru, but it's not valid as we haven't seen her in action yet. We only know she's capable of carrying Kenpachi while leaping between buildings, and has a reiatsu so high it takes the shape of a face, only shared with Kenpachi and Ichigo.