Envision the end result. Eschew personalities.
If the end is worth the effort of all involved, then it doesn't matter how many are involved, or who gets the credit for what gets done.
At the end of it, you will either have been successful or unsuccessful. That will be the time to count and list casualties.
When I was a kid, we were told by no less a personage than Davy Crockett, to "be sure you're right, then go ahead". That seems to be pertinent advice.
Sounds like what Robert A. Heinlein said: "Never let your morals keep you from doing what is right."
Unfortunately, personalities may or may not know how to achieve results, but they can lay land mines. So you can't ignore them entirely.