Tobi_444
Unfortunately it seems that he will depend completely on inherited techniques, he has an Uzumaki by his side he could very well learn from her, considering how little has been shown of Kushina's personality I very much doubt that she would refuse to teach, if he doesn't evolve further from Tobirama's model, he will almost have no relevance in the fourth great war, Minato had the Kurama mode and it had almost no relevance, to a weak ootsutsuki that can greatly increase the MC's power and he is Isshiki, Tobirama was a very Orochimaru's healthiest and most talented, some of his techniques were obtained through human experiments, so the model must have some experience in this area and should be able to steal Isshiki's chakra and perhaps even take part of the DNA.