I'm with you - at the beginning of the season I would have been thinking Myers or the established Weber if Myers didn't continue to improve.
However - Karlsson is a highly touted D who has been given a lot of ice time and responsibility in OTT.
I'd be leaning towards the offensive upside of Karlsson in OTT over the stability well rounded guy in Weber. Karlsson has passed Myers on the young D ranks in my mind as well......
Karlsson