I like Cruz. But Cruz is going to have a rough time in the next hew weeks. Meanwhile Trump will be winning primaries. The GOP may find that the best way forward is to bite the bullet and nominate Trump. Paul Ryan is refusing to be the nominee. If Cruz had won a lot of southern states, then there would be a stronger case for him. Look at Arizona, Cruz got trounced here in this GOP stronghold. I really think Cruz has a weaker hand than many have been saying.
The big question is how many delegates will Trump have going into Cleveland. Right now he has a big lead. And it is about to get a lot bigger.
In reference to the bolded section of your post, "the GOP" has zero control over the process. If they had control, they would've prevented
trump from running in the first place. As it stands, they cannot prevent Cruz from recruiting his own backers to be
trump delegates.
As for
trump's lead, his margin doesn't matter at all; what matters is what percent of total delegates he has. He's at 44% right now. If he wins
every single available bound delegate (which won't happen) in both New York and on 4/26, he's still only up to 49%, and he'll then be declining again once Indiana and the Pacific Northwest vote.
trump's path to the nomination is an extremely narrow one.