>> The GOPe doesn’t want Cruz. When they turn on him Trump will make him an offer he can’t refuse.
That doesn’t make sense. Assuming for the sake of argument that the GOPe is merely using Cruz... they won’t have any reason to turn on him until after he has defeated Trump, and at that point it’s too late for Trump to make him an offer.
Cruz blocks Trump from locking up the nomination with 1237 before the convention. At some point Cruz realizes that the GOPe isn't going to give him the nomination. That's when Trump gives him a call offering the VP slot if Cruz unites with Trump to stop the GOPe.
To prevent this the GOPe will string Cruz along as long as possible. Trump will have to act fast, and Cruz will have to be ready to make a deal or they both lose everything.