Everyone gets buried before cashing in MITB, not pushed.
Dolph's beat me to it. Remember how much Daniel Bryan was winning before he cashed in MITB on Big Show? I sure do...I also remember how much people were bitching that he was getting buried prior to cashing in (they had a point...he was basically buried prior to his cash-in).
So, his "push status" really has nothing to do with whether or not he cashes in, which probably means they're saving it so he has it when Cody returns, no doubt leading to it becoming a storyline point between them. Also, figure the ADR-RVD feud isn't completely over yet and they figure ADR needs the title for the feud to mean something (since that's why RVD's interested in fighting Del Rio).
From a kayfabe viewpoint (since Dolph's insists on the kayfabe stuff), he was no doubt worried about cashing in while RVD was still in the ring and obviously pissed off. Since RVD's after the title (and not a personal grudge win over ADR), RVD might very well have seen his opportunism as a reason to stop him.
wk