True all trueIt's hard to say for certain from gameplay footage but it certainly seems like Sheik's grenade works quite differently from Snake's. It seems to be an impact explosion rather than a wait and is still attached to the chain, giving it completely different physics. Though losing one grenade is nothing against Snake's massive arsenal. He could just use a different type of grenade instead.
I'm sure some of you have already read the article on Hideo Kojima saying that he has no idea whatsoever whether Snake is returning and that it's entirely up to Sakurai (which is certainly true) but that statement scares me a bit, for Kojima to be able to bluntly say that he has no idea this late in the game.
Thought I don't think it's an impact grenade. It's manual detonation.
Also, Konami could be hiding the fact. Though this Smash game is less dark then Brawl. I don't think Snake would fit well (visually) in this game.
For instance, the change to the Ray Gun to make it look less gun.