Your optimism is inspiring but possibly misplaced. Trump voters may be loyal, but how loyal are the Trump delegates?
I will be voting Trump (my second choice) because I want the convention decided on the first ballot to avoid shenanigans. I don't believe Trump will gain delegates after the first ballot. I expect him to lose a lot of votes each round, unless he starts courting delegates, and I have seen no sign of him doing that. I also don't believe Cruz will gain enough for a second ballot nomination. While I think Cruz would make a better (perhaps much better) president, I do not believe he can make it to 1237 either. If Trump doesn't get to that total on the first round, I expect the nomination to go to someone who supports Amnesty.
This is why I am so irritated with Trump for his casual approach to delegates. What's his problem? I don't care if his claims that "Cruz is stealing delegates" motivate his supporters. That won't matter if he doesn't have a first ballot win. Trump was perfectly capable of an outright win on the first ballot, and he's not making the effort he should be making to guarantee that win.
Or is there anyone who thinks 70 registered republican voters in WY supporting Trump was his best effort? Is there anyone who thinks Trump could not have gotten 1,000 supporters to the caucus locations for the WY caucus, which would have given him far more delegates than Cruz with 600 supporters got? If Trump loses, it's because he didn't try hard enough - the blame falls squarely on Trump if he falls short by the number of delegates he could have earned in WY and so many other caucus states with a minimal effort.
Trump is not being careless about getting delegates!!! Trump has hired the pit bull of delegate getting!!!! Manafort’s results WILL be held VERY close to the vest!!! Trump NEVER will let his enemies know his battle plan and people who work for him are fiercely loyal, just as his supporters are fiercely loyal!!!! CA. will ve gravy where delegates are concerned !!!