What about a major gaming icon?
Cause that's why Sakurai would like the idea, beyond a moveset itself. Nintendo choosing him because he has a Nintendo presence/to promote him is not hard to believe.
Remember, Sakurai absolutely has made it clear that having gaming icons is his main goal for 3rd parties. He can be convinced otherwise. Like how we got Bayonetta. She was not iconic when added, nowhere near the others. But something else got him to do it. Could it be Nintendo forcing his hand? Seeing cool combos? Who knows.
This is wrong too. He never said those guys were "first thoughts". What he said was these are just not options at all. "Sakurai: But on the other hand, if you think about who to add from Final Fantasy, it’s hard to come up with a choice that’s not Cloud. We could have used Terra or Bartz, protagonists in their own right, but I feel like there would be some people who wouldn’t know who those characters are. " Nowhere does this at all indicate they mattered.
"Sakurai: Exactly. And within the FF franchise, Cloud is without question the most popular choice. A number of people fixate on the fact his original game was never released on a Nintendo console, but if we were to limit our choices to characters who appeared on a Nintendo console, we’d end up with Bartz from FFV or the Onion Knight from FFIII—how would that work? Maybe they could change jobs or something… Actually, that would be kind of interesting (laughs)." Likewise with this. Again, not really saying they were important too. They were just notable enough to mention at best. Onion Knight is just a Dissidia/crossover character to represent all the classes. He's like Mr. Game & Watch, not a regular protagonist.
He never said "roots with Nintendo" either. That's poppycock. All he cared about was FF's gaming history in general. What he said is that if Cloud wasn't available, he'd have to just choose some Nintendo guys, then listed about 3 overall among some interviews. This is not an indication of anything other than they're recognizable names and that he does his research.
People need to stop acting like Cloud was anything more than a major gaming icon pick. He was the only real choice for Sakurai to begin with. He noted how the other two options were just bleh and unfeasible. Just that maybe ideas to use 'em could be fun. It's a basic developer thing to note that other characters are cool in their own right, yet still dismiss them.
That said, maybe you saw something I didn't. But the only interviews I saw only dispel the notion that it being on Nintendo mattered.