I think Trump has tried to give the impression that anyone loyal to him will be pardoned. The actual pardons are a whole 'nother issue, though. First, of course, are the optics, especially if the loyal Trumpian is convicted of many crimes and some of them look particularly unwholesome. Second, as has been observed upthread, once someone has been pardoned, they can't take the 5th if they're subsequently summoned in connection with Trump.
So Trump doesn't want to actually pardon them, he just wants them to think they'll be pardoned if they don't turn on him.