'Cruz needs Rubio to stay in until Florida and split the vote - otherwise Trump walks away with the delegates.'
Not necessarily because I think there are still some proportional elections left. It goes winner takes all from March 15 onwards.
'Cruz is very much not an establishment candidate'
We are told that the Establishment hate him and it is true that none of them like him. Bob Dole, now 92, prefers Trump to Cruz and says that Cruz would be "catastrophic". But in reality Cruz is just another puppet who will easily be controlled by the donor class. He didn't declare a loan he got from Goldman Sachs, his wife worked for Goldman Sachs and she was a member of the Council on Foreign Relations etc I am pretty certain that the Establishment would be able to control Cruz (although he would lose the election to Cruz but the Esatblishment wouldn't care) but they can't control Trump which is why they fear him even more, and some of the top ones already know they may be doing prison time if Trump gets in.
'In fact Cruz's victory speech last night was almost Trumpian - he talked about howls of anguish in Washington.'
Yes, he plays the anti-establishment card (because he knows that the people are in revolutionary mode) and to some extent he is, but the huge crowds for Trump show that the people know that it is really Trump who is the anti establishment candidate who will go to Washington and "kick the doors down" and "break the furniture".