Bad life choices, injuries and getting old. Nobody knows when jones or any other fighter was clean or at their cleanest.
One of the main issues was that jones stopped training as much and DJ and other fighters stated that Jones use to be at the bar every night drinking after training. He was also a addict during that time as he was kicked out of wink for running around with a group of goons, getting drunk, doing cocaine, and getting in trouble.
Motivation, life choices. getting old, and many other things. During his backend at LHW, he was a mess. DJ talks about it at length with another fighter about jones always at the bar drinking, just getting drunk. Jones coasted on talent but it caught up to him as age did. You cannot drink every night after training at 34 and think it will not catch up to you. You cannot do cocaine one week before a fight or during training and think it wont catch up to you. At that age, he could not get away with what he could when he was a young explosive athlete.