This would be similar to Garry Chalk's cameo in the first movie, or Nolan North making a cameo in the Uncharted movie, or Jodi Benson cameoing in The Little Mermaid remake.
If Mike Pollock appears, it could be as a bullying local who attempts to terrorise children with his "Eggman" voice, only for Robotnik, or Agent Stone to scare the guy away, thus showing him who the REAL bully and villain is.