After announcing the signing, 25-year-old Jake, 6-0 as a professional boxer, issued a challenge to Diaz -- a boxing match followed by an MMA fight -- against the combat sports superstar from Stockton, CA.
It's not that Kevin doesn't like Jake vs. Nate ... he's actually into the fight.
"Nate Diaz is a good fight. I'll give him that, but there's two problems with the Nate Diaz fight. Nate Diaz ain't going to take that fight, let's be honest. They're going to go back and forth for months and years," Kevin said, explaining Diaz would first need to sign with PFL, which Lee says will not happen.