If the Melech HaMashiach can come from the dead, then how do you know for sure that Shabetai Tzvi was not the Melech HaMashiach?
Even if you say that he failed to fulfill the prophecies from Tanach, you could say that he will fulfill the prophecies from Tanach, when he comes back to life again.
If the Melech HaMashiach can come from the dead, then how do you know for sure that the-founder-of-a-certain-religion was not the Melech HaMashiach?
Even if you say that he failed to fulfill the prophecies from Tanach, you could say that he will fulfill the prophecies from Tanach, when he comes back to life again.
Once you accept the Melech HaMashiach from the dead,
then ANYONE be the Melech HaMashiach!!! ANYONE!!!
And if you say that ANYONE did not fulfill the prophecies from Tanach,
you could say that he will fulfill the prophecies from Tanach,
when he comes back to life again.