My understanding of it is that Kunitz was no mean player when we traded for him, but he took extra steps forwards as a player to become the nightmare force that was 2011 Kunitz i.e. there had to be some internal development. Might be wrong, but that's my read of what's said around here.
Nah. Kunitz always played the same game. Only thing that changed with him was that he spent more time looking for soft spots as he aged (then eventually lost his hands) and less time hammering guys in the corner.
Whitney was the reason the trade happened (and the reason it didn't look lopsided until years later). Whitney had the look/reputation of a #2 D with great size when he went to Anaheim, so, at the most general, it was a #2 D with great size for a #4 wing with mediocre size, which is an on-paper win for them.
Unfortunately for the Ducks, Whitney wasn't what he seemed, partly because he was already damaged goods at that point, which wouldn't be expected with his age and lack of obvious physical injuries. At that time, it was probably
Kunitz who carried the injury concerns.