Simple solution, Trump wins every primary.
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Trump OR Cruz. Their delegates at the national convention can support either candidate as needed to prevent GOPe/RINO/Rubio chicanery.
Realistically I don’t see Cruz winning. I like him, but his poll numbers just aren’t there. If he doesn’t win IA, NH or SC he should drop out and endorse Trump, IMHO.
That’s one reason Trump maybe shouldn’t burn every bridge behind them. If Carson ends up with delegates, he might have been persuadable to give them to Trump, but after the way Trump attacked him, he’d surely give them to Jebio.