Trump knows full well that Colorado wasn’t stolen and that he began there on a level playing field with Cruz, but he didn’t do the necessary groundwork to compete. But he also knows that his supporters will believe otherwise and become more entrenched if he cries foul loudly enough. He hopes to draw supporters away from Cruz and woo the undecided in upcoming states by leveraging these allegations in service to establishment/Cruz conspiracy theories.
Cruz dined like a vulture on the delegates prepared for Jeb, without acknowledging how they were prepared.
He broke no rules and he is a vulture who proudly fed off a scam at the expense of 1,000,000 voters. There is no evidence of leadership in that, no matter how much you try to rationalize that mere cleverness is the qualification we want in the next president.
I won't say that Cruz is a bad man, though I may suspect it strongly. I will say though that he is not entirely a man. There are parts missing in him - mentally, in his character, and spiritually - no matter how much he'd like you to think that quoting verse and lofty philosophies and legalisms, preparing and practicing sharp debate and rhetorical points, is a substitute for character or ability.
Trump's faults on on the outside, clear for all to see. Cruz doesn't even know half of his, and the rest he considers assets but hides. Usually he's not even Lyin' Ted, he's Sneakin' Ted, Clever Ted.