Did he have the dangerous doctors?
Do you mean a DEVIL DOC?

Don Youngblood did. Chad Nicholls prepped Youngblood for the 2001 and 2002 Master's Mr. Olympia contest, as well as for the 2002 Mr. Olympia contest, when Youngblood was 48 years old, and fresh off his 2002 Master's Mr. Olympia win.
As far as John Meadows is concerned,
short answer: I think John was/is mostly his own coach.
Long answer: I'm not aware of John Meadows working with anyone reckless - or...let me put that another way: I don't see John as being the sort of guy who would ever be in a situation where he doesn't have full veto power over everything he does for bodybuilding and contest prep.
In other words, John had a great deal of bodybuilding knowledge, and I don't see him as being the sort of guy to do a dangerous drug cocktail unless he himself wanted to do it.
I am a lot more confident in my belief that Don Youngblood would have eaten or injected anything Chad Nicholls put in front of him. John has been studying bodybuilding since he was 13 years old [basically since he watched the 1985 Mr. Olympia as a teenage boy], and I don't see him doing anything reckless that he didn't put serious consideration into.
I'm not saying John didn't do anything reckless, gear-wise, I'm just saying he wouldn't inject a dangerous cocktail of cutting agents just because a guru told him to do it. If a guru told him to do it, and he felt it was sound advice, I could see him doing it. But I couldn't see him take on any risks that he didn't give serious thought to, regarding the costs and benefits.
Competing in bodybuilding is a risk, period. Especially over 40. So he knew what he was getting into.