Maybe, but Graham’s public switch from never-trumper to sickeningly obsequious ass-licker was so abrupt and shocking, there had to be something serious behind it.
trump, having been raised in the mob and still controlled by it (this time the Russian oligarchs) knows how to use blackmail as a weapon. He’s got plenty of secrets - his own and others’ - that he is clever enough to keep hidden.
In my opinion, trump’s first move on someone who disagrees with him would be to get the person under control, through hush money, blackmail or physical threats, a la Cohen. If the person succumbs, then that person’s part of the family and is rewarded with perks and protection. If the person continues to show “disloyalty,” then trump leans hard and tries to humiliate them publicly. And he never forgets a slight.