Do you have any evidence that the rules in Colorado were changed without notice? If not, give up this ridiculous straw man argument. Trump had the same opportunity as Cruz to win those delegates. The fact that he could not get organized puts the lie to the arguments that Trump is so smart, such a quick learner, and "only hires the best people".
Being involved in County politics, I feel certain that the rules were changed in a stealth manner. Precinct Chairs rarely know what the state party is doing much less their own county party.
That is why many CO delegates for Trump showed up expecting a fair process. Sick of Cruzbots rationalizing for this Harvard Lawyer/Crook.
Thankfully, I will be leaving the party and for sure will never vote for Cruz. Depending how this transpires, I may actively work against him.