Thanks, you're right. I had confused the definition of 2 [W]. PHB 278 set me straight.
On the flip side, for line 85, the Bugbear Rogue Shadow Ass. 11 Torturous Rapier 22/21, it looks like his feat damage is simply 2 X his normal damage, as in line 55 for the Bugbear Rogue Shadow Ass. 11...