Trump needs about 500 delegates of the 870 (give or take) left. Ted needs about 700. Kasich needs all of them and a couple of rules changes.
What’s this guy smoking?
Since Cruz is stealing Trump’s delegates, if Trump perceives he will not win the nomination on the first vote, I expect him to tacitly, or otherwise, favor rules changes that allow someone other than Cruz. I expect him to adopt a NeverCruz position that matches Cruz’ NeverTrump behavior.