Regher and the 2nd rounders were parts of getting Fasching and Deslauriers. You cant just cancel them out of the equation. Otherwise you have to cancel out Fasching and Deslauriers too.
You're kind of missing the point. Regehr and the 2nds are both coming in to the Sabres and going out from the Sabres in your "calculation". Therefore, they aren't part of the organization's net change
Saying something like:
So ultimately the trade ends up being:
Sabres send:
Butler
Byron
Regher
McNabb
LA 2014 2nd rounder
LA 2015 2nd rounder
Sabres receive:
Kotalik
CGY 2012 2nd rounder (McCabe)
Fasching
Deslauriers
fundamentally does not make sense. The way you constructed it, you're double counting all of the assets that the Sabres gave up, when most of them were in fact acquired for other assets the Sabres gave up. You're saying the Sabres gave up far more than they did.
If you want to look at it like it's an equation:
Byron + Butler = Regehr + CGY 2nd (McCabe) + Kotalik
Regehr = 2 LAK 2nds
McNabb + 2 LAK 2nds = Fasching + Deslauriers
Adding them together gives us
Byron + Butler + Regehr + McNabb + 2 LAK 2nds = Regehr + CGY 2nd (McCabe) + Kotalik + 2 LAK 2nds + Fasching + Deslauriers
The common terms on each side of the equation cancel each other out giving us:
Byron + Butler + McNabb = CGY 2nd (McCabe) + Kotalik + Fasching + Deslauriers