Assuming the hypothetical situation that PTAB judges are not principal officers and they are not currently being overseen by a principal officer — because Director Iancu has resigned his post — should forthcoming PTAB decisions be considered valid, until a new Director/principal officer is confirmed by the Senate? After all, some argue that PTAB judges are inferior officers because a Director purportedly supervises them and a Director is a principal officer. What about when there is no Director/principal officer to supervise the PTAB judges? You might recall that there was an extended vacancy in the USPTO Director position between the terms of David Kappos and Michele Lee.