He's as tall as Jones. Has similar leg reach, and his arm reach is shorter, but not by a lot. So if he seriously bulked up I can see it being competitive, but with his current body frame he would get dropped on his fucking head and destroyed.
Jones wins easily
Swamp Donkey -Jones wins easily
Jones. Wrestling and utter destruction on the ground. If Gastelum caused Izzy the problems he did, Jones would be a nightmare