I’ve often thought about a Final Fight storyline following Cody being thrown in Jail, then escaping. (One of the SFA3 flyers features Cody punching through a brick wall of some sort, so I assume he simply punched his way through his cell wall)
Anyways Cody is a much more interesting person since he has inherent character flaws which caused him to lose his g/f and get thrown in jail (it’s still unclear what for exactly, whether caught brawling or actually killing someone).
He feels more like a Ryu/Ken gone wrong, a more tragic character which enough backstory there(comprising of Mad Gear) to keep the story going.
If you want to know more about Cody’s storyline, you should play the Final Fight Advance version, it has a reworked storyline which adds a bit more depth to the relationships between the characters when you realise Cody loves fighting so much, he could just have easily been a member of Mad Gear.