Nope.
Wouldn't go back to former owner, period !!!
You know why? This animal already went through hell. Already came close to dying. Already lived in filth and neglect. That animal deserves a fresh start.
If he is "so so" sorry, and truly thinks he could do better, he should do this
First of all, research how to do everything right, join a forum such as this one, read caresheets.
THEN, buy everything that is needed to properly house a Ball Python. The right way. Everything.
THEN, set up everything, dial it in, test if everything runs right, stays right
THEN buy a well established, healthy BP from a breeder and KEEP it healthy.
If he isn't willing to go through all these steps, his "dedication" still isn't where it needs to be. It may never be. He doesn't deserve to get back this animal that he almost neglected to death. That animal doesn't deserve to go back there EVER.
How "easy" it would be for that guy to just take back the "fixed" animal and "all is peachy". To easy.
Perhaps he should just get a pet rock or something.. yes, harsh, but what that animal went through wasn't a walk through a park, either.