^ Well, I don't know about "heavily." Picard was arbiter, yes (and again, this was only because K'mpec made him so), but it was still Gowron and Duras' job to fight it out for leadership of the council. And the only reason they didn't do that was because Worf killed Duras - which was a Klingon matter, not Federation.
Clearly Gowron was the more honorable candidate, but if Duras had survived and won, Picard wouldn't have been able to do anything about it.
So if you're arguing that the Federation was responsible for Gowron's ascension, or that the Federation was too involved in the succession, then I'm afraid that's not true.