Honestly I never cared for Jiraiya like some people. It always upset me that he was Naruto's godfather, but he neglected visiting him or keeping tabs on him as he was growing up. He's supposed to be a master spy. He should have known what was going on and stepped in to help him.
I have an idea if naruto can control his cells he can manipulate any who taken his cells like a back door for his cells or create a technique that can link his cells....
You should give Hinata the powers of Reiki (the zero tail) they both have black chakra which will increase Hinata's power it's just a proposal if not good luck and work for the future