In a normal Universe, a pardon obtains after conviction and punishment/restitution.
Here we have Trump rushing in even before sentencing, in effect telling the Courts to butt out, that he knows better.
I can see in this a kind of testing the waters, to see how far he can go in future when looking to circumvent legality concerning cronies and witnesses, all with the aim of dodging responsibility for his own malfeasance. But I don't necessarily credit the dolt with the cleverness to figure this out fully; most likely help from one or more perspicacious players is in play. Although what Orange brainpower could be brought to bear would certainly be directed toward his own immediate and personal needs.