MC needs to mix and power up his powers in these 3 months. I can't see even a slightest of chance for him to do anything without having his healing/immortality at at least 80% of what Funasaka was capable of. Maybe if he could have mixed it with Rudels if he had went for it? He truly should have stolen some more powers, some kind of physical augmentation and maybe some kind of "blink" ability to cover short distances quickly. I bet that the author has amazing way to deal with the problems (since I was never disappointed with what he came up with) but I can only think about how he should bruteforce Tesla and steal his Talent, take out Nobels heart ( OHKO), remix Tesla Talent into some kind of railgun/laser gun and try shooting down Gagarin from earth. Damn, I can't wait for the next chapters. It's just so exciting thinking about all the possibilities after seeing the war between the Greats