One thing I have learned in MMA is never be too quick to say there is no one who can beat someone. The only fighter in MMA that cannot be beat in his weight class is GSP, but he lost along the way.
Regardless of how good Jones is, he will get beat sooner or later. After seeing how easily he can throw wrestlers down, how vicious his ground game is, and seeing him outstrike Shogun, it's easy to think there's no one to beat him. But I would place money down to say that a LHW currently on the UFC roster can and will beat him.