Looks to me as if Cruz is working the system to win a contested convention and Trump is now preparing the ground to run as an independent (Tea Partyish) candidate. Cruz is playing states' rules because Trump has no ground game. Trump will justify reneging on his commitment to the Republican Party by saying the Party reneged on its commitment to him.
Kasich hopes Cruz and Trump can veto each other and he emerges as the electable compromise candidate. But neither Cruz nor Trump is likely to agree to that.
I think we are headed for a split GoP.
And this is what Paul Ryan is preparing for.