May friend Pat C says:

“It is interesting that Trump did not pardon Stone, but rather commuted his sentence. A presidential pardon takes away a person’s right to stay silent in court under the right established by the Fifth Amendment to the Constitution not to self-incriminate. It does so because there is no need to worry about conviction: you’ve been pardoned. A commutation does not take away that right, so Stone now cannot be compelled to testify.”

Yes, interesting isn’t it. The mob has always had good lawyers to play the system to their advantage.