I'm not sure what the heck is going on right now, but it smells bad, he may get out or he's waiting for something to go down at the convention.
No, Kasich has plenty of success and history in politics under his belt, he’s not going to go Kamakaze for the party. Even if he loses to Trump, he’s still a relatively popular governor with plenty of future political opportunities in his future. He won’t throw that away for the party.
Rubio on the other hand, he’s pretty much Politically DEAD as an electable figure if he loses his home state in the primary. He isn’t running for re-election to the senate, and him sticking around to be humiliated in the vote kills him politically. So he may be more than willing to cut a deal in exchange for something from the party to stick around to just try to stop Trump.
Frankly if the reports are True and Rubio is having rallies expecting 5000 only having a few hundred show up a week out, wisdom would say pull out... He’s a first term senator, he loses his home state big, he’s back to running for dog catcher if he wants to try to resurrect his political career.