CanadianHockey
Smith - Alfie
??? WOW! I can easily name 5 DEF "that I've seen play" that would qualify to be better than Karlsson. (Not necessarily offensively, but all-around)
N. Lidstrom, R. Bourque, C. Pronger, L. Robinson, C. Chelios
Yeah I wouldn't argue Karlsson was the best defenceman in history pre-Karlsson. I mean, on top of your list, there are guys like Orr, Shore, Harvey, Potvin, and Park - and even Coffey for OFD.
With that said, I don't think it's unfair to think Karlsson has the potential to be up there. Perhaps just behind the names you've listed, alongside guys like Brian Leetch.