He certainly can't be worse than Stafford has been and will likely relish a fresh start under anew coach in Buffalo.
Combine that with the fact the Sabres don't save much money buying Leino out this summer vs Next (10 million to buyout this summer, 7.33 next summer), I think Stafford probably has more value in trade vs Leino
Sure he can: he can be last year's Ville Leino.
Stafford most definitely has more trade value than Leino, I agree. I'm sure there are several GMs hoping Darcy sells low on him a la Roy last summer.