Right, it's not close to one for one so if it isn't Kapanen + a 1st round pick, they can get MUCH better offers out there from teams who would love to have Necas.
Kapanen has almost zero value. He's an RFA who's a year away from UFA, and teams know the Penguins aren't very interested in keeping him -- it's an open secret so they have zero leverage.
Necas is 3 years younger, so there's MUCH more flexibility to either sign him to a bridge deal and still control his rights, or sign him longer term. Also, he's a natural C (even if he's been playing mostly W in CAR). So Necas value is MUCH higher than Kapanen.
Re. Bear, you don't have to convince me anything about him, he's of absolutely no interest to me, and I don't see where he would fit on the Pens. I wasn't the one who brought up his name (the OP did). I'm just saying that, objectively, Bear's value is similar to Kapanen -- in that either he's not qualified and ends up as a UFA, or his trade value is in the realm of a 3rd or 4th round pick.