I think people are using the word "manager" too much with Heyman. He probably isn't exactly a mouthpiece for Punk. He's more of "sports agent" nowadays. It's a different dynamic and I think think in the end it's more about Heyman siding himself with a money maker.
Something like that maybe a better fit. I just against this idea that Punk needs Heyman to get heat he has proven in the past like in his feud with Jeff Hardy just how effective he can be in getting heat. Its just at the moment he doesn't have an interesting enough character.