If you can prove the soul doesn't exist, like some in here implied then that would be extremely important to your arguments.
You can't prove a negative.
I can not prove the non-existence of souls any more than you can prove that the invisible dragon in my basement is not real.
However, one can notice that so far no evidence for a soul has been discovered, quite the contrary, plenty of evidences exist that, far from being some kind of metaphysical eternal ether, one person's conscience and personality is the product of brain activity and subject to physical and chemical contingencies.
In short, there is less evidences for the existence of souls than for the existence of Big-foot.
And, even if the souls were proven to exist, it would not change anything about Jesus, as he did not 'discover' the concept. He just reflected the predominant beliefs in his society. You would expect any first century Jew to 'know of' souls, it is not any more surprising that them knowing of wine or fish... It just reflects the intellectual make up of this population, that this make-up is right is quite irrelevant.
The only way it would be relevant would be if Jesus displayed some insights that would not normally be available to him.
Accurate and uncontroversial predictions would be great but even some scientific insights, mentioning the DNA double-helix, for example, of the heliocentric system and Matthew 21:21 would have been a great opportunity to add a little titbit about plaque tectonic...
At any rate, the opportunities were many for an all knowing God to casually prove that he was special...
Instead, we have a few vague, short term prophecies that either had already happened by the time the Gospels were written done (postphecies) or just plain did not happened (Luke 9:27). We have factual errors (Matthew 13:31-32) and misremembering of the Bible itself (forgetting about Elijah in John 3:13).
All that that would be expected from a purely human, if charismatic, first century prophet but not from the all knowing incarnation of God...