Solharath
[ZTD] CEO
More derived from the explicitly stated, but that's where we get some of our news from.Same with every other character in the game. It's a work in progress, after all. What source is there that explicitly states that Sonic was significantlty less finished than any other character?
Sakurai stated on the Dojo that he was iffy on Sonic's presence on the E for All Demo disc. Deriving from this, we can guess that Sonic isn't exactly all done, and I'm sure this meant for some of the moves with the physics they had, and especially the Alternate costumes.