To address your point I requested that you ask the same question about any of the establishment Republicans and Democrats? And you dodge the point by not answering the question.
Again, I defined "hardcore" as being unwilling to vote for anyone except your preferred candidate, and being willing to support your guy if he runs third party. That metric isn't relevant for the other candidates because there's no chance they wouldn't support whoever the nominee is, or that will run third party of they don't get the GOP nomination. So personally, as someone who has a huge preference for DeSantis at this point, I would not consider myself a hardcore supporter under that definition because I'm going to vote for the GOP nominee, and I wouldn't support DeSantis in a third party candidacy.
But that is a relevant metric in this thread given that this thread raises the specific possibility of Trump running as a third party candidate, and also because there are a fair number of Trump supporters in this very thread who have said they won't support any other candidate but him.