Chara and Weber both weren't among the top 3 scorers last year but were finalists for the award.
True, but the other two in the top three were Byfuglien and Campbell. Fugly is not a very good defenseman and if memory serves spent part of the season literally playing as a forward, not just as a defenseman who essentially acts as another forward. Campbell only had 4 goals and got 30 of his assists on the PP.
I was obviously exaggerating in that it's not always literally 1,2,3 like this season, but it seems to be getting closer to that. And if you pick the top 3 "name" defenseman with the most points you have a great chance of being right about the nominees, regardless of whether they actually had a solid year defensively as well.