you know..... i was just thinking... these might be bad suggestion but will it be bad if Renzo got nickname like dota earthshaker and his weapon cuz he said he need to move his epicenter why not use the totem to channel it. i mean it will putting other element in the mix idk if that ok with you?
I hope there is a time skip of this while showing him learning different tecniques and strenthening his body. Maybe its because of the devil fruit that the old guy cant see his spirit, its been rumored by fanon that there is a devil in each fruits.
Can you give the mc the power to communicate with the previous users of gura-gura like OFA or those mc's that get possessed by their teachers in the time of need