Cruz knows he has no chance of being anointed by the GOPe, which is why he is fighting them tooth and nail at these state Conventions. Cruz understands that if he doesn't fight for the seating of his delegates, the GOPe will put their own delegates in those spots.
Trump on the other hand is convinced that he will win on the first ballot, so he has done nothing to protect his interests on any subsequent ballot. Should no one get the magic 1273, then you are going to see Trump's delegates abandon him for Kasich - not Cruz's delegates.
So your contention is that Cruz, who opposes and is opposed by the GOPe, is fighting a battle that he mathematically cannot win (he’s been eliminated).
And in doing so, he will potentially be a roadblock to ANOTHER candidate who the GOPe opposes virulently.
So, because he can’t win on the first vote, he’s going to try to prevent another person doing so as well - even though both are hated by the GOPe.
If that is what passes for the Cruz style of logic, then heaven help us!