I really have to disagree with most all of this.
Panik is 24 and he's being played as a 4th liner averaging 10:48 in ice time, on a terrible team in Toronto. I don't see him as an example of why Hejda needed to be traded.
Peca is a work in progress, and there's tons of guys out there that could be described as having Dominic Moore potential. Maybe he gets there, and if he does he'll be a good example of a return on a player that wasn't in Tampa's plans. Given the fact he hasn't yet, and is 21 and a 5'8" 155 lb college player, he has some hurdles to overcome first.
Witkowski is about to turn 25, has 10 NHL games, and was just sent back down to the minors.
These draft picks that aren't good enough for the NHL, did not have that much bigger of an impact on their AHL success and what Johnson and Palat eventually turned into, than what an AHL free agent signing would have. I don't see how bringing in AHL players was a reason why they had to move someone like Hejda for assets, and it's a little unfair to attribute Johnson and Palat's success to the moves made to acquire their picks.