Agreed, but how is Yandle not a #1. He is still elite offensively and his defensive game really isn't that bad at all. I don't think lacking defebsively and not overly physical is enough to make him not a #1, especially when one of the best Dmen in the league has the same complaints about him.
Because Karlsson impacts the game more than any defender in the league IMO. I would say Yandle is a bit more inconsistent in creating offense and I disagree with the notion that his defensive play isn't that bad. It is certainly his weakest point and one of the biggest qualms against him as a player. Physicality is also crucial because a lot of puck battles are won through sheer strength at times. I would say Yandle doesn't fare too well on the forecheck either, from what I've seen.
Don't get me wrong - I think the price that they paid for him was a steal. There are plenty superior prospects to Duclair in this league, John Moore is nothing special and the picks will be in the latter half of the round anyways. Plus Yandle is staying for another season at the very least.
I just don't think he's quite at the #1D level.