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Agreed. The infinite boost actually makes it easier to get S ranks here, unlike Super Sonic in the Wii version; it's more because of the different scoring systems, though. That of the DS version relies much, much more on time of completion, which means Super Sonic (who has infinite boost himself) would still be plenty useful for S-ranking.
When you see a Japanese word and you don't know what it means, then it's probably a Street Fighter move.