I love Advance Wars, but I don't want Sami to inherit Snake's moveset for several reasons, even if he is cut.
For one, it just doesn't seem fitting for Advance Wars. I always thought if an AW character got in, a sort of summon or pet character archetype would be more fitting, in which the character could summon units to aid in battle. Well, that's the gist of it basically, dunno how it'd work. Eitherway, Snake's moveset is more designed around being patient and sneaky in laying your traps and also camping to get the advantage. That really screams MGS to me. Isn't the reason Snake is so heavy in Smash is because MGS has heavy controls, as well?
I also don't think it'd be a good substitute for Snake, unless the moveset isn't tweaked much, but I can't imagine Sami being heavy, powerful and slow. Advance Wars deserves better than a borrowed moveset, anyway.