I think the thought is that while Weber was sidelined, Petry played like a top 2 D and that level isn’t sustainable for him. If he declines then his bLue will drop. To your point, if he continues or improves than his value will as well. Just erring on the side of caution that current version of Petry is maximum velocity Petry and a reversion to his mean is more likely. Add to that the Habs aren’t really contenders and he can likely get a 1st plus to add to our group of youngsters and it’s a better recipe for success for our future and you can see why trading a RD like Petry for the right price could be extremely amicable for the organization.
Further, unless we’re way out of the playoffs by trade deadline, I think it’s more likely he’ll get traded at the draft. If we’re still in contention, which at this point is highly likely, he’ll most likely not be traded unless it’s a stupid deal and he’s replaced with a younger top 2-4 LD option to play without weber.