“How do you define OnlyTrump?”
People who said they would not have voted for any other Republican nominee.
And, post election, people who want to somehow purify the party down to only those who promoted Trump in the primary. or only those who vote for awful ideas just because Trump favors them. People, including The Don himself, who spoke of primary-ing out HFC members who were against TrumpRyan 1.0, for example.
There are close to zero of those here. So I don't know who here you are trying to bash. There are many, however, who would not have voted for another Bush. Most of us would have gone along with a Cruz, although in my case, he really turned me off at the end of the primaries. He (and Ben Carson to some extent) were the only conservatives in the race other than Trump, but I realized early on that Cruz was just not going to be able to win any more states than Romney had. He was just too stiff and unlikeable. Rubio and Walker had some fans here. Most of the others, there may have been a lot of people who could not hold their nose again just to vote for another RINO. But most people would have eventually come around, if only because...Hillary!.
So, I think you are wrong to impugn FR by claiming a significant presence of OnlyTrump and that they were as bad as the nevertrumpers.