And you can take it to the bank that that’s exactly what they would do.
The system is rigged such that Trump and Cruz could go into the convention with 90% of the voted-for delegates between then—and then have have the GOPe deliver the nomination to one of their RINO butt boys instead.
Cruz gaining too much on Trump increases the likelihood of that scenario, given that it is very unlikely Cruz will win the majority needed himself.
Not really, because the delegates still have to vote for the nominee. So, there might be a first-ballot that would have Cruz and Trump both come very close to the 1237, and then the gamesmanship would begin, with people trading favors in order to try to get their candidate over the top. But the party itself wouldn’t have control over the delegates.