I feel like, a year or two ago...people wouldn't have blinked at that sort of ask. But between injuries and just drop-off in his play for whatever reason, it definitely sounds a bit rich right now. Getting a physical, Top-4 RHD who can move the puck at the deadline though, with another extra year on his contract at a reasonable $$$ number...that's the sort of piece that always ends up in at least a small bidding war that can ratchet up the price.
Teams will find a way to justify that extra cost, because he's "not just a rental". And honestly, if he's healthy, and gets back toward the level he
was playing at not so long ago, and finds the right fit wherever he lands...whatever team coughs that sort of package up, could still end up entirely satisfied with their purchase.
Also really depends on what exactly they mean by, "top prospect". That's always a pretty nebulous term when it gets thrown around. But i get the impression in this case, it's more in the sense of, "one of the team's top few prospects" more so than a "top 50 league wide" sort of prospect. But which end of the spectrum that actually falls, changes the composition and "value" of a deal pretty substantially. There's a lot of "wiggle room" in that definition. As well there probably should be at this stage, considering it's still fairly early stages of getting a deal put together. Behooves the Ducks to float a high asking price...but one loose enough that they can easily sell to fans later as, "we got what we asked for". Doesn't hurt for the acquiring team either, if they can later sell it as, "we got them for a bargain, less than they were asking". Play it both ways.