kaisch and rubio could be conspiring with the GOP establishment but i doubt cruz is part of it but he's a (sometimes useful) tool
it would only be in the winner take all that you'd see that kind of behavior though, and as i stated IL and MO are hybrid winner take all (congressional level). so really it's if kasich is keeping out of FL and if rubio is keeping out of OH. i'm not sure they'd keep out of it entirely either... unknown. they could just back off each other in those states and not really hinder the other