The Messiah doesn't have to fulfill every prophecy first before you can confidently and positively identify him as the Messiah.
Suppose there's 100 things that he is foretold to do, and it is utterly improbable for anyone to fulfill even 20% of them, while Jesus has fulfilled 50% of them. You can reasonably believe that Jesus is the Messiah, and expect that he will eventually fulfill the rest.
Or you can refuse to believe until he fulfills the rest, which includes the part where he judges the living and the dead and condemns the wicked to be punished. But by that point it will be too late for your belief in his identity to do you any good.