It is not the same. The Summit League is a true Basketball conference, it has no football. The MVFC is a football Conference, it has no basketball. The xDSU's have the benefit of being in two conferences that focus on one or the other. The Big Sky in my opinion (don't jump on me for having an opinion either) is a football conference. All of the decisions the Big Sky makes are geared toward football. And for that reason basketball will suffer and is/has suffered for it. The MVC years ago recognized that football and basketball could not co-exist so they split out the football and made it its own conference. The MVC has flourished in basketball because it does not make decisions based upon football.
I don't know why the Big Sky does not do the same thing and split off football into its own conference. That would allow the Big Sky to add teams like Denver, Oral Roberts, Wichita State etc. that does not have football. That was before Wichita State went to the Final Four. Gonzaga would have also been an option years ago, but the Big Sky would never consider anyone if they don't have football. But now the league has so many football programs that I can't see the Big Sky adding any more teams.