If its true that hes the person responsible for creating such a jutsu than he mustve been the most sinister hokage of all time. Just look at the price for using this technique. Someones life. Aaaand how long do you think it took him to create it? How many failed experiments? How many dead bodies?
The main reason is why would he create it. Is it because he saw his brothers death(hashirama)? Is it because he wanted to revive hhis dead lover? Whatever the reason its still despiicable. This jutsu befits Orochimaru but not Tobirama. How can a Hokage create such a hutssu?