He has yet to meet a single qualification for the job, other than being Jewish.
How do you know that it isn’t Bar Kochba - he at least fought foreign armies successfully to make Israel free and unite the Jewish people. There is also some evidence that he was starting to build the 3rd Temple. He was also Jewish, and descended on his father’s line from King Solomon. That’s quite a bit more, according to Jewish scripture, than Jesus ever did. So why can’t it be him... because he’s dead?
Well, yes, actually that's why it CAN'T be him. This Bar Kochba IS dead but Jesus of Nazareth is NOT dead. He arose from the dead as attested to by hundreds of eye witnesses as well most of whom were willing to go to their deaths rather than deny what they saw with their own eyes.
Naysayers can twist or deny a few passages of Scripture but there are over 300 of them! After a while it starts to look feeble and desperate.