In order to beat Jones imo, you gotta swarm him and overwhelm him, make him uncomfortable before knocking him out with a power shot. Tt would also be very very very helpful if said person has a size advantage over jones because jones has shown in the past that he has more issues with guys around his size or bigger than him, but of course, jones always pushes through. Yoel romero's style is not to overwhelm you as it more of a "less is more" style, and Yoel Romero doesnt have a size advantage over him but Romero has shown in the past that he's able to close the distance with larger dudes, however jones knows how to bully smaller oponents with his size advantage. Jon Jones is tricky in the octagon and knows how to not get hit, so i'd say Jones would win although you should never ever count out Yoel Romero, literally all he needs is one punch and Jon Jones is out cold, and Jones' weakest feature is his striking (not to say hes a bad striker of course).