While I don’t disagree that the bug should’ve been caught, because of how the disk is described as a chance to block shields, playtesters may have just thought it to be a string of good luck on their end. They also may not have spent too much time with DWD Nick disk as the Mr. I disk would’ve needed to be properly tested as well.
That being said the delay I don’t feel was due to milking said heroes apparent strength. DWD is the newest character and I think would’ve had deals for him regardless of whether or not the bug existed. There is also the fact that the balance team was working presumably on Gaston and the hero refreshes coming next patch.
On top of the time it takes to open code and fiddle around with it to fix the disk while at the same time making sure nothing else breaks in the process. There should be at least some leniency with them in that regard. As they have found a way to fix it and did so the next following patch.
Quorra is a different issue entirely. She was more than likely nerfed not because of PVP but rather because of the next mode to be released soon called Invasion. In which you fight from what I have seen, raid bosses and uncapped Max Hp damage would make her ridiculous in said game mode. I also don’t believe that she was milked for her power. She had 2 characters made to specifically counter her in Shank and Ursula. That would be the more egregious action to me rather than Quorra. Instead of fixing Quorra they make a couple characters to counter her and milk those instead.
At least those are my two cents on the subject. Feel free to disagree, but I think DWD was handled to the best of their ability.