Even if Cruz could prevent Trump from getting the nomination on the first ballot, there is no way he would get the nomination on subsequent ballots. The GOPe hates him just as much and is using him. Jeb! has more of a chance of getting the nomination than Cruz.
Cruz is such a fool.
Many of these delegates that he claims to be supporting him due to his vaunted ground game are simply nevertrumpers.
If he somehow pulled off denying Trump the 1237, Cruz would need 500-600 delegates to switch to him on a second ballot. Heck, maybe more depending on how many pledged Cruz delegates stay with him.
Even Kasich knows the later is a pipe dream. Which is why he hangs around like a vulture.
Now, that said, I do think it’s important for Trump to get well over 1237. If Trump loses Indiana, but manages to get to just at, or over 1237 I fully expect shenanigans in the credential committee.
A Trump win in Indiana could lead to a near sweep of the remaining contest whether Cruz drops out or not. Would be nice to roll into Cleveland with 1400 or so.