The only problem with the whole concept is, we've never seen Steven want to hurt somebody. We've seen the soulless Pink Steven apparently hurt every powerful character in existence at the same time with a single shockwave, enough to scare human Steven.
We know he has immense physical strength, enough to lift a whole-ass city block wide and skyscraper tall drill made of space metal out of the ground and over his head.
We know he can summon spiked bubble gauntlets over his fists to punch with.
But the fact remains, Steven has never wanted to hurt anybody, even when they show no signs of doing anything but wanting to hurt him. He doesn't attack, so every matchup can only amount to a stalemate.>>110385792
For instance, Steven is most definitely more powerful than Goofy. Steven wouldn't even be phased if a rock dropped on his head, and his shields have tanked things way beyond anything shown off in the Keyblade Graveyard (a magical explosion literally shaped like a nuclear mushroom cloud)
Steven could just get in a bubble and roll around all day like Sora doing a dream eater attack, and have no issues with basic heartless. And for the tougher fights, he can literally jump miles in the air and float around if they try to speed blitz him. That's if he doesn't just stay in a bubble until Xehanort, Xemnas, or whomever, just gets tired.
As always, it just comes back to: they can't beat Steven, but Steven has no willingness to hurt them, even if he may or may not have the power to do it.