The only proof he is using to say he was a co-founder is a YC application. This is I hope a non-binding document. I hope judge agrees that the only way to get equity in a company is if its granted in the form of shares. Jeremy was never granted any shares so he own's 0 shares.
He also acknowledges he did no provide any IP to the company. So if he didn't provide any IP and didn't receive any shares he should be entitled to 0.
I really hope Kyle wins and Jeremy is found guilty of tortorous interference and is obligated to pay for Kyle legal fees.