Man that game doesn't get enough credit among nintendo fans wanting to kick out snake from Smash. As an alternate reality sequel to Metal Gear 2 it's pretty damn good.
Yeah, Ghost Babel / Metal Gear Solid GBC is hugely underrated, it's a completely serviceable Metal Gear title, with a ton of content (main quest, VR missions, plus remixed versions of the main quest unlocked after completion). It's a bit weird the way it's structured into discrete levels, but it works well enough.
Ah. Seems like a reach imo. I wouldn't call that "appearing" on a Nintendo console exactly, though, I have no problem with Raiden being in Smash in some form.
Oh, don't get me wrong, I accept that it's tenuous at best, but it's enough of a loophole to work with if they *wanted* to make it happen without breaching that 'core principle'.