Hear hear.
Imagine if you were a captain in one of PJ's draft comps and your first round pick was the 4th pick in the draft. Crucial that you make good use of your first pick and with so many strong players still to pick from. Imagine if you made your choice, feeling like you'd picked the right person, only to have them withdraw from the comp after a couple of rounds. So instead of having one of the other top round picks (who committed to the comp), you end up with the 41st selection.
I certainly agree that wouldn't be fair on your team, the opposition and PJ, and it certainly wouldn't be fair on your captain.