Sonic Team head Takashi Iizuka has (again) been asked about the possibility of Shadow the Hedgehog appearing alongside Sonic in a 'Classic' series scenario, and the exec's response was that fans really shouldn't hold their breath for that to happen (again).
While discussing the upcoming Sonic Superstars with GameInformer, Iizuka was clear that there wasn't a chance of the Ultimate Lifeform joining the Sonic, Tails, Knuckles and Amy gang as a fifth playable character. Or even as an additional adversary alongside Dr. Eggman, Fang the Hunter and Trip the... Sungazer Lizard?
"Shadow is from the Modern series of characters and gameplay that we have introduced," Iizuka said. "The Classic series exists before the Modern series, so they haven't met at that time. There's no relationship, so we won't be bringing Shadow into the Classic series."
I mean, it makes sense really, if we're sticking to timelines here. But Iizuka, ever the joker he is, followed this up with a chuckle and the words, "Unfortunately, Shadow was in a capsule at that time [that the Classic Sonic series takes place]!"
Well... you really can't argue with that, can you? Maybe this will stop people from asking Iizuka this question for good now. Just leave the poor man alone - he has a family don't you know?