Negan and Rick are similar in ways. By hey both believe what they are doing for their community is he right thing. Negans way is just a little more abusive than ricks way of leading (and that's saying something).
The governor on the other hand was a phsycho and sociopath with a severe split personality (eg. Taking his dead brothers identity and keeping his niece locked away as a "biter".)
I think that if this was to happen (which it obviously won't, but theoretically speaking) negan and Rick would team up against the loon.