IMO
Rocket
Howe
Hull
Orr
Gretz
Lemieux
Lidstrom?
Crosby
Ovi
McDavid
Guys like Morenz, Shore, Beliveau, Harvey, Lafleur, Espo, Bourque, Dionne, Jagr, Trottier, Bossy, Potvin, Yzerman, Sakic, Messier, Coffey, Mackinnon, among many others, have strong cases, but fall just below the line, for me. All the guys above dominated the league for a time, and were acknowleged as the best. Ovi is the one guy you can argue, but he scored so often, for so long, that I think he belongs.
Bedard is still super young, so it's too early to say anything definitive about him(Lafleur was underwhelming in his first three years), but I don't see generational. If he can be mentioned in the same breath as the group in the paragraph, or in the Kane/Mahovlich/Perreault/Mikita tier, it would be a great accomplishment.