For one he is firmly behind Jagr, and arguably Ovechkin, to me. Secondly to me a player who is generational is someone that transcends generations, meaning they would probably(arguably) be the greatest in any era- Ovechkin for example is a generational goalscorer but not player. Suppose it depends on how strict you are in your definition to me there are 4(arguably 5) generational players and I suppose you know who they are- Hasek is the arguable one and I might add that Jagr could very well be seen as one if didn't tail the two greatest offensive talents of all time, Crosby? Not so much.
If Crosby makes the generational cut off I see no reason to leave someone like, for example, Karlsson out of it. Crosby is simply not that rare breed of a player- Trottier, Forsberg, Sakic, Clarke, Miktia(and so on) all pretty much the same.