what possible reason would the UFC ever have to co promote with Strikeforce or M1-Global?
not gonna happen my friend.
The chance to indisputably prove themselves as having the greatest fighters in the sport.
But your right its never going to happen because for one it would not work out that way for them and they know it, it would only expose there bluff. And secondly as keeps getting mentioned over and over again to the UFC its all about themselves as long as they keep selling PPV's that's all they care about, and they don't care if they damage other promotions trying grow the sport to do it.
As for Dana and those who claim to be MMA fans but really are just UFC fans Trash Talking against Fedor, do you ever see any footballers, football managers or anyone in the sport at any level from head of Fifa to a casual fan do any trash talk towards Pele?