Cruz supporters will never support Rubio.
But would Rubio supporters favor Trump or Cruz?
AS long as Cruz/Rubio mostly split the Trump opposition, Trump wins easily.
It looks like Trump gets enough Rubio supporters that losing Rubio would not give Cruz the win, except in very close states. Besides, Kasich gets a significant share of Rubio supporters if Kasich is still in the mix.
Cruz voters will go to Trump. Never to Rubio.
Trump has eased up on Cruz during this TX primary because he knows he will need TX in the future and that Texans really know and care about Cruz. Cruz voters will eventually help him. I am a Cruzite but this is the way it is going to go.