Ego
It’s more than Ego.
He (they) feel entitled to run the show.
They aim to stack the rules committee with Cruz delegates and change the rules:
1) totally change the primary process for 2020- for Cruz’s favor
2) 2016 allow for any candidate with 1+ delegate to be nominated
3) 2016 DQ individual delegates and unseat state delegations on rules issues
4) 2016 push for ‘rogue’ delegates- unbound - super delegates
Regardless of how he stacks the rules committee, he will be unable to stop the Trump Train. Trump’s delegate count will be 2 1/2 times greater. And he’ll probably round out with 5 million more votes. The more, the merrier. The Trump Train needs to keep rolling, full speed ahead.