Doesn't like either Cruz or Rubio are in a position to win their home states. If either entertains any hopes of defeating Trump, they're going to have to join forces.
Honestly, I think Trump has the best shot of defeating Hillary. I haven't been following the numbers of voters participating in the primaries, but I think Trump is going to need some of these disenfranchised Republican voters to win. After all, how many times has he topped 50%.
The Clinton scenario you propose is the one I'll focus on.
Thanks.