Certain? No. And if he does he’ll almost definitely win the nomination. But if he doesn’t there’s a much better chance that Cruz will be nominated on the second ballot than Trump.
You are wrong.
“But if he doesn’t there’s a much better chance that Cruz will be nominated on the second ballot than Trump”
You’re not allowed to divide by zero. There is NO CHANCE that Ted Cruz is going to be nominated on the second ballot or any other ballot, at least not by the Republican Party at its planned convention in Cleveland this July.