Nah. I don't think so Majesty.
Spinks could not even beat Karmazin by a wide decision, hell I think he lost that fight.
And Cory NEVER beat Mayorga, FAR from it, he lost nearly every single round.
And to be fair Mayorga has not knocked anyone out since he burst onto the scene KO'n Vernon the first time. So I don't think he'd actually KO Forrest, but maybe. I see him knockin him down a couple times, embarassing him and generally making him his bitch though.