hindsight is 20/20, ted.
it's an adult thing to admit when you're wrong. but, he ought to have just lost the argument, for good.
presuming he sweeps tomorrow, he won't need any of these states outright, and the states that cruz is conceding are proportional (meaning it doesn't matter).
the reality is that trump has already won. and, it's 100% cruz' fault.
http://www.theguardian.com/us-news/2016/apr/25/ted-cruz-and-john-kasich-team-up-in-deal-to-stop-trump
https://www.youtube.com/watch?v=1CpRCc4Jre8