Maybe, but even at the end when it was Trump vs. Cruz vs. Kasich Trump polled well ahead. I don't think that quantity really was the determining factor -- I think Trump is just the natural end state for the way America seems to be at the moment with its massive political division and the inability for either side to treat the other with good intentions.
People like voting for winners and it was clear that Trump was going to win the plurality of the vote by that point. It also came at the end of a long and grueling primary that served to normalize Trump and rally establishment republican behind him. There is no way he would have won against a generic republican if the race started with only two candidates.
Really agree with this post
https://medium.com/@russroberts/the-world-turned-upside-down...