User blog comment:Smash The Echidna/A curious observation of mine/@comment-5142578-20180105055525/@comment-9749276-20180105062524

The last time GUN was mentioned was in Sonic Riders Zero Gravity. If GUN is indeed around, they may have either a) been off-screen allies/members of the Resistance or b) affected by the Phantom Ruby in such a way that they see the world still being alright and not under Eggman's rule.