that's an excellent point! I never thought of it. I guess they'd first try to kill each other and than gang up against the rest of the universe =)
Londo/Quark would also be an interesting pairing. And Worf/Lennier.
Btw, did you ever notice that B5 is the only SciFi series where there is no ingenious engineer among the main characters? (At least the only one I've seen so far.)