What IF: Tarkin betrayed Palpatine??
Lets say during RO/ANH, after Tarkin is in command of the Death Star, he realizes that he now controls "the ultimate power in the universe" and doesn't have to listen to Sheev any longer, so he makes a power play to become the new Emperor. What happens?? Can he do it??
***For discussions sake lets say that Vader isn't on board the Death Star when Tarkin turns against Palpatine. Lets also assume that the Rebels catch wind of Tarkin's treason, so they stop all of their attacks to let the Empire fight itself.