Ronnie does have about 10 years of extra bodybuilding under his belt, with all that implies
(training, diet, guestposing, stress, injuries)
There is to be some other explanation imo, Yates is still on the sauce (no way only TRT/HTR) and he looks very good, Coleman still on the sauce also but looks melted and with Palumboism... In 1997 Yates was a train wreck with big gut and torn bodyparts, seemed on his way to Palumboism, but he recovered and today no sign of that disease and tight midsection... How he recovered from that?
Ha, Alpha Yates living the dream!