Just use goggle, if you want to look up something.
Carson threatens to leave Republican Party | Fox News

The problem is define winning the primary. If anyone does have enough delegates to win on the first ballot, they haven't won the primary. If the Republican higher ups don't think that Trump could win the election, why would they nominate him?

Trump knows that he can't win as a third party candidate. He hasn't stuck his hand in his pocket yet. What makes anyone think that he would dip into to fund a losing cause. That would be stupid, and we all have been told a thousand times by Trump himself how smart he is.