Nate would probably only beat KZ assuming the other guys don't brain fart and just stand and try to swing at Nate.
Frankie has great movement, boxing, wrestling and has already fought LWs.
Nate would not be able to stop the Wrestling of Mendes either but Mendes's chin might be cracked for good so there is a chance for an upset.
Aldo's leg kicks will demolish Nate. Nate will land a bit because of his long boxing but I think the damage will add up on Nate and Aldo has the option to take him down.
KZ is most likely to try and fight Nate. His TDs also come more from the clinch which will be way less effective. Also it would be crazy to count on anyone of these guys being able to Submit Nate so a big part of KZ's game is kinda nullified.