IMO you keep Stafford. We'd be able to run 3 scoring lines, because we'd have 3 LWs (Vanek, Foligno, Leino), 3 Cs (Ennis, Hodgson, Grigorenko), and 3 RWs (Pominville, Stafford, Armia), with Girgensons being a wild card. Armia can be fit in without moving Stafford. (Plus, it's the Sabres...you have to expect half of those guys to get injured which will also help fit guys in).
not sure why we are moving stafford? he is a key part of the team.
Especially moving him for a maybe in Armia.
I think the assumption here is that Armia has a strong camp/start to the season and makes Drew either our 3rd line RW or entirely expendable. Not sure I'd do it either, because our forward group outside of Vanek and Pommer is already scary young and because Stafford has that great chemistry with Ennis, but if we're projecting Grigorenko and Armia in the line-up, this team is again going to be hurting for more gritty players.