Originally Posted by BadTrip
Just keep in mind that every highly successful MMA practioner today has been forced to be well-rounded. This is not the late 80's/ early 90's any more. [b] Back then there was a movement to see which discipline was most valuable and successful [b].
And that question was answered quite clearly back then: Jiu Jitsu.
Today, as you mentioned, cross training will prevent this kind of single discipline dominance.