Board Thread:Site Discussions/@comment-26497831-20150627200920/@comment-477304-20150627205501

Well chronologically Shadow came back in Sonic Heroes, but even then the reason for the game shouldn't null the information presented to us in it.

As for Mario and Sonic, there isn't really any clear indication what he's doing, the glow of his hover shoes doesn't outright prove he's using them for his speed.