So DeSantis is a clear opportunist thinking Trump will be taken out by the criminal cabal or taken so low that he, DeSantis, can get the nomination and possibly the presidency. That's a dealbreaker.
Pence is also a clear opportunist for the same reasons plus, rather than help defend President Trump from the crimes being committed against him, Pence has slyly piled on. That's a dealbreaker.
All of the others are also-rans anyway, so no use wasting time on them.
If The GOP Primaries are rigged or ignored and Trump is shut out of the GOP Convention (I remember when Reagan was shut out the first time). If he is dumped like they did Buchannan (I still remember the moving “Rejected Stone” Speech Pat made at the end—it set the stage for the Tea Parties that came). If kicked aside I believe Trump should go 3rd Party and make the GOP pay bigly. If the GOP do that to Trump—they have made themselves enemies of MAGA and deserve to be replaced by a new Reform Party with high ideas. If, and its a big if, Trump calls for a new party—I and millions of others will follow.