Depends on how “clear” that front runner is at the convention. But never fear, if Trump comes up short on delegates he’ll use his magical deal making abilities to get the nomination. And what better way for him to win—that would actually unite the party behind him too. It’s probably best for Trump to get a contested convention. He gets to display his amazing deal making abilities and unite the party behind him!
It's pretty clear so far. Trump has over half again as many delegates as Cruz, and nobody else comes close. And the number of votes he has gotten is even more lopsided because most of Cruz' wins have been caucuses.