Well…Saint DeSantis endorsed Trump when he dropped out of the race. The obvious conclusion is that a shrewd conservative like Ron sees Trump as sufficiently conservative to go back to the White House. Perhaps he understands that there is a time for internal battles…and a time to unite and win back the White House…and thus save the Republic. Anything less would be, potentially, permanently damaging to the conservative cause.
So, I’m with Ron DeSantis on this one.
Alternatively, DeSantis is a man of his word and had agreed, as a condition of participating in the debates, to support whomever the nominee was going to be. Because the entire reason he dropped out was that he didn't believe it was possible to beat Trump, that's the guy he was obliged to endorse.
Personally, I really dislike the GOP requirement that all participants in a debate must pledge to support the eventual nominee. Especially because they don't really enforce it. If they are going to have such a pledge, it should be limited to agreeing to support those candidates who also agree to that pledge.
At this point, I personally do not see Trump as being part of conservatism, so I don't see it as an "internal" battle at all. But the debate precondition was supporting the "Republican" nominee regardless of whether they are a conservative, so I understand why DeSantis had to do what he did.