This is actually exactly what they do if a contested convention is in play. Trump could also steal supporters of committed delegates of others. Some delegates are bound beyond the 1st round, like Florida which If I remember correctly are bound for 3 rounds.
What is wrong with the puppet masters? If folks realize that their vote doesn’t matter, all *ell could break loose.
Trump earns & works for delegates Kasich & Cruz covet & steal.
Trump’s only chance is to have enough delegates at the convention. If he’s one shy. And i hope he is... it’ll go to someone more deserving.
And he’ll have nobody to blame for it but himself. he’s publicly insulted his opponents, their wives, the journalists, people of faith. Etc.