^While I definitely agree that Zeo is one awesome dude, he wouldn't exactly make for good Straw-Hat material, what with him being an evil (yet goofy) racist radical like his captain and all.
But having said that, I've gotta say that I find his fight with Brooke to be the most entertaining in the storyline by far. In fact, Brooke's growth as a fighter impressed me the most out of the Straw-Hats in general. I had originally figured that he'd learn techniques similar to the supernova Apoo, but I was pretty much blown away by his new soul powers. I'm definitely tempted to believe that he's now as powerful as the zombie Ryuuma from Thriller Bark.....