#2. There is going to be a clash of visions
As you figured from the last point, the creative difference was what ultimately drove Heyman out of WWE. Let's take for example the very same PPV - December to Dismember. The poorly-promoted show saw an Elimination Chamber main event, featuring the likes of CM Punk, Bobby Lashley, The Big Show, Hardcore Holly, Test and Rob Van Dam.
Heyman was big on Punk, but the young Straight Edge superstar wasn't anywhere close to Lashley - who was Vince McMahon's definition of a superhero and a top star. While Heyman wanted Punk to go over, McMahon was adamant that Lashley was the man who needed the win.
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So in classic fashion, Punk was eliminated first with no pinfalls, while Lashley won to a chorus of boos. The point of this is that there's bound to be creative differences even now. With McMahon being adamant about certain ways, Heyman and Bischoff may have a 100 incredible ideas for their respective shows, but it's very unlikely that they'll come to fruition.