“Simple fix. Immediately upon taking the oath, he signs Trump Executive Order 001, reinstating the general effective 20 Jan 2017, 12:02. All fixed.”
Are you sure this guy is incapable of participating in a coup attempt? I would not be so fast to ask for him back. This happened for a reason.
"If" Obama caused the dismissal for purposes inimical to Trump, Trump can immediately reverse it. "If" Trump caused the dismissal, then he certainly has a replacement on tap and ready to go. In either case, Obama and his allies lose.