Injury or no injury, you don't get to cross prospects off the "available" list when the trade target is a 24 year old franchise center with 355 points in 375 games.
Lemme fix that for you...: "You don't get to cross prospects off the "available" list when the trade target is a healthy 24 year old franchise center with 355 points in 375 games. Likewise, you don't get to play the "injury or no injury" card when it's the biggest variable in the whole deck..."
If you seriously think that every GM out there isn't factoring in his injury status & the absolute unknown if he's going to come back completely, wind up in a wheelchair after one hard hit, or every scenario in between those two extremes, into any offer they may be considering... well, yeah
Buffalo is free to ask whatever they want. Similarly every other GM is free to offer whatever they want. 'If' a trade can be worked out before Jack has some sort of surgery & plays enough to prove he's healed & still elite, don't be too surprised when Buffalo has to take a heavily discounted offer.
I hope for his sake that he does get his neck fixed & comes all the way back. But unless/until he does, no team is going to gut their future (a team in a 'win now' mode) for a player that might not be able to contribute. Similarly a team that's not ready to make a deep playoff run (such as the Ducks) would be fools to gut their future for a very expensive player (and we'll be nice and assume he's healthy here) when they aren't ready to compete until the final year or two of his contract.