That video, they don't have their cloth on.
The kick is not a reason although I still think it looks cool. If Kurumada wanted to make him a main char, he would have done it. Kurumada had plans Jabu to be a main char but then he dropped him out and I want to know why he did that. Just look at the number of lines he have at the beginning of the series compared to the other saints.
The minor bronze saints have some screentime but it's not much.
http://www.youtube.com/watch?v=G9LgLYK8y9o
But seriously, I still think Jabu should have been a main char, I don't know, cuz Shun kinda piss me off.