Yeah, I agree. I always liked the Vader/Tarkin relationship. With the Emperor/Vader, Emperor was clearly the man in the charge via political power and mystical power. The Vader/Tarkin relationship was really interesting in that Vader had more real power and also military power, but Tarkin had beauracracy on his side, and he was able to get Vader to listen to him and wasn't scared of him. He used the tools he had to his disposal, so while he wasn't as physically powerful as Vader, he could do what he pleased. Sort of like a, "When you're under my roof..." mentality.