Realistically, anything trying to make sense of that would have to include
both of them, anyway—plus Eggman Nega!—so just make it Silver X Blaze Generations, I guess! lol Then you’d at least have Sonic ’06, the Rush games, and the Rivals games to pull from, which are the only main series games where Silver and/or Blaze are actually playable.
But I know SEGA will never do it, so I’ll just have to live with my own headcanon, lol:
Also, while Silver got to be in Forces, at least Blaze was actually invited to Sonic’s birthday party in Sonic Generations, unlike Silver (I know it’s only because he was a rival in the game, but still, lol). If she can hop dimensions for a birthday party, why the hell
doesn’t she visit more often?? She should have been in Forces, too! lol