Yeah, from what hear about Karlsson (amazing offensively, awful defensively) he sounds like Mike Green 2.0
I don't know if the stats tell the whole story though. Fowler's +/- would indicate that he is far worse defensively than he is. He's more than adequate on the defensive side of things and getting better. He had some truly atrocious defensive partners last season like Lilja, Brookbank and Sutton.
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you just can't live in that negative way...make way for the positive day