the thing about caribu is, he is still not out of the picture. we still dont know the guy he mentioned as "you know who" that he was trying to score points with. he will probably show up later, and hopefully with more character development.
his way of fighting is pretty cool actually, he is just too weak, both in character and in battle, to be a strawhat. unless some major changes happen when his boss shows up, we already have a good fealing who it is anyway XD, he is a no go