In a league that doesn't award Face Off Wins and also awards PIM and shots, I think you lose out here by dealing Buff for Thornton. Especially since Byfuglien plays D/RW. I get that you need centers but with FOW as a category, I think you need a lot more to make this work.
Edit: I saw the Burrows/Garrison part as well but the big pieces just don't fit for me.