I think the Wiki is looking way too far into it. Especially when it comes to spin-offs, the games which aren't even meant to be taken seriously
(e.g. Sonic Drift, Labyrinth, R...) A good portion of the games listed are in weird places in the timeline.
Making a 'true', definitive timeline is kind of hard, but if we're talking about the games which are
canon/important to the series, the basic timeline would go...Sonic 1 > Sonic CD > Sonic 2 > Sonic 3&K > Sonic 4 > Sonic Adventure > Sonic Adventure 2 > Sonic Heroes > Shadow > Battle > '06 > Rush and Rivals in some form > Secret Rings > Unleashed > Black Knight > Colours > Generations
Time of release/development should dictate where games fit into the timeline. If it fits in, leave it as it is.
Edited by Neon, 21 March 2012 - 12:42 AM.