I wonder just how overwhelming he'll be once he starts making decent progress in project Metabody, like he'll be approaching Senior realm of power with only a Squire's body.
To be honest, He neglected Several Techniques that cover all Fields, when he could of learned them easily.Now this defintely shows why Rui's Martial Path was not possible for any other Martial Artists.....it requires too much.
so my guess for the healing is that the mutation he will cause will cause a lot cancer cells. He an then have his body eat those through autophagy to heal himself.
