Trump/Cruz will never happen. Cruz/Rubio exists but is impossible because Cruz would never be selected at a convention. Rubio will likely be thrown under the bus because they know his financials are vulnerable. At the convention they will pick a safe GOPe candidate. If they are really really stupid, it will be Romney or Jeb. If they are a little smarter, they will pick some random “acceptable” fool the base doesn’t know enough about to hate automatically.
That’s why, at this point, Trump must win. Once it gets to convention, the GOP will be in charge. We know Cruz sold out since he’s already told voters he thinks Amnesty/TPP Rubio would be a better President than Trump.
Cruz/Rubio would have both their eligibility questioned. I think it would be very stupid for them to run together.
There is no possibility of Cruz on a ticket or Rubio on top of a ticket. If Trump does not win then Ryan is the nominee or outside chance Romney.
I think by the time of the convention, the RNC will realize Trump is there dream candisate. If Cruz wins the most delegates, the RNC will probably give us a Trump/Bush ticket or some Trump /celebrity tocket.