They need each other to beat Hillary/Sanders. It has nothing to do with Cruz.
There is no way Cruz closes the gap by Iowa. So Cruz will lose Iowa then he will get beat horribly in N.H. and Trump will run the board from there. Cruz won’t win a single state.
But Trump doesn’t need the GOPe attacking him during the general election.
I’m lived in Iowa half my life. That ain’t what I’m hearing.