I think about the issue of the "revival of the dead" that you see it very clearly in Ezekiel. You have there the valley of bones and then God telling Ezekiel that that whole event of reviving those people was a sort of preliminary example of what would be eventually with all Israel. That is, that He would bring about the revival of the dead for all Israel.
So that means when the Gemara asks How do we know revival of the dead from the Torah, it must mean how do we know it from the Five Books of Moses. They can not be asking how do we know it from teh Prophets.
