Think about hat has happened in that time:
The sports biggest star ever, McGregor came and went
A UFC champion boxed Mayweather
Ronda went from non main eventer to biggest star in sport, to greatest ko victim in history, to WWE and now a farmer
All the champs have been replaced except Jones
Triple C went from Olympic gold medalist to C3, beating the unbeatable mouse, and BW GOAT TJ on his way to the top
Aldo and Cain have turned in to .500 fighters
Jones has pissed hot like 100 times, had events moved for him and is still undefeated
It is such an impossible sport to stay on top in, and I think the only way is to be allowed to juice and your competitors made to fight clean. It was no surprise Andy's closest fights were against guys busted for juicing or guys that looked like shells under USADA (cough cough Teh Chris). Clean Jones = fringe top ten MW without the roids.