User blog comment:Slug-Drones/Blaze Sonic 2006 conspiracy/@comment-3027069-20130604125032

So what you are basically proposing is that the intial team of Sonic '06 had Blaze in Elise's place, that there was no Elise character, presumably flowing the same overall plot of having a fire monster trapped in side of her (possible the source) and struggling to control her emotions. Sonic's interaction with Blaze would cause her to lose control of her emotions and cause said fire monster to emerged and go on a rampage.

Then the team was changed and thus the story was altered as well. They created a new character based on the ideas for Blaze but, for reasons unknown (or perhaps because she is a popular character), they had to keep Blaze in the game and thus put her in SIlver's story (without any explanation as to how or why she was there) because she was too similar to the new character.

Does that about sum it up? Your theory sounds logical and is very possible. Very few video games start out with a solid, concrete plot (usually they start with a single concrete idea that a plot is built off of), thus a single game could go through hundreds of story changes of a period of development. Given that '06 was done right after the successful Rush was released, it would have been a standard move for a gaming company to released a big console title that featured the Blaze character.