F depth chart was also a strength of ours when we had Granlund, Nino, Coyle, Zucker, Larsson, etc. Then it wasn't. Have some patience. Wait to see who actually meets or exceeds expectations, and who falls short. Trying to win the game before the game starts is how you lose the game.
OP is trading a 22 year old middle six C with potential for a draft pick.
If he valued defense he would trade that player for another similar aged and similar caliber defenseman.
He may want a defenseman, but he is putting the mystery box defenseman over the established forward.