The thing with giving Snake's moveset to somebody else is that the moveset was made
specifically with Snake and Metal Gear Solid in mind. It wouldn't make sense.
The better idea is to bring Snake back, because you know, people like the character himself, and then add an Advance Wars character apart from Snake.
As much as I go on about unique movesets and what not, there is validity to the characters themselves. People LIKE certain characters. If they gave Snake's moveset to some character, that wouldn't go over well.
I still think Snake is one of the best characters to add. Anything people come up with against him boils down to personal bias (which is irrelevant because he's a Smash veteran already, so he's a valid option) or Konami problems. But I don't really know how much the issues matter.
Frankly, Smash is a game that celebrates the characters. Sakurai could easily bring Snake in through a contract with Konami, and honor the character his friend created anyway. Speaking of Snake, on my way home earlier, Calling to the Night started playing off of my iPod. The feels...
By the way, that's Snake...in his appearance in Brawl. He's a Smash vet. That HAS to mean something to people. I feel like people ignore that fact because they simply don't like them. People who don't like him haven't played Metal Gear Solid. If you play the series, THEN you might think differently.
I've said it before and I'll say it again. Smash celebrates
gaming. Not just Nintendo, but
gaming. Why else would Sakurai have allowed Snake in the first place? Snake isn't Super Meat Boy. Sakurai had to have seen value in Snake when he originally planned to add him. Some use the reasoning of "not Nintendo enough" as if Sakurai hadn't considered that. Now we have Ryu.
It's a game that celebrates gaming. Will they openly advertise for their competitiors? Probably not. But they included content from a PS4 exclusive game in Brawl in the form of trophies from MGS 4. Not that big of a deal if you ask me.
Eh. Whatever though. I doubt I can change some minds. People will think what they want. It's too bad.