User blog comment:SalaComMander/Knuckles' Torment/@comment-1945883-20120410234612/@comment-1945883-20120411003921

All the other characters were playable in Co-op (except Charmy) in Shadow, so why is that different than KC? The only difference is that the Chaotix are playable alone.

Here's a better example: Sonic Adventure is considered Sonic's game even though Tails, Amy, Knuckles, and the rest are playable, right?