Desanctimonius didn’t want his endorsement and doesn’t want to be seen with him in public, hence the snub during Trump’s rally in Florida. He’s trying to keep the Romeny/Ryan wing of the party happy. It’s becoming more clear.
He really has no choice. Comparatively speaking, DeSantis is flat broke and has no future in politics unless he plays Step-N-Fetchit for the money behind the Republican Party.