Brother...
First...why should he use drugs now? What's the point? He is almost 45 years old and he is not a stupid kid from the gym...he's an IFBB legend with the best contest history of all time. He don't want to prove anything anymore. He just loves the spotlight, loves bodybuilding, wants to motivate his fans and wants some hype.
Second...in 5 weeks an average stupid kid could achieve a better progress on drugs. If Kevin would use drugs (with one of the best genetics ever in bodybuilding) he could be a whole different person in 5 weeks...
Why? Why does Milos still use insulin and growth and steroids? He will never compete again!
Why does Strydom still use tons of drugs?
Why did Nubret use lots of drugs into his 70s?
I agree that he doesn't look like he's on a "real" stack but there's tons of reasons retired bodybuilders find for using drugs. Come on now.