No, I'm not comparing him to the way he looked in the 90s (after 25 years or so, you'd think he get a little bigger). I'm referring to his off-season look vs. contest look. I've noticed that with other guys who compete in natural federations, especially the heavyweights.
They look much better at high-single-digit or low-double-digit body fat levels. Contest time, they look emaciated and all too often, they get beat by some symmetrical smurf.
Personally I think Mike looked absolutely fantastic at that show. There is a crisp quality to the muscle/skin that is somewhat unrelated to the degree of leanness. Compare Levrone in 92 vs to later Levrone. Levrone put the difference down to GH, he said he was unable to capture that look again and it was all due to GH. Others have noted this as well, many have said they were so much more "cut" back in the day. But in fact they used to be much fatter.
It is also true that less steroids can lend to a much more crisp look. The so-called naturals and even the true naturals have a quality to their look that juiced bbers can't capture. Perhaps it's partly due to less water. All steroids cause water retention. This doesn't mean Mike was a lifetime natural at that show, he just wasn't on as many drugs. I was at a show a long time ago and a certain competitor stood out, he was small but he had a crsip quality to his look unlike anyone else and I said to my friends, including an IFBB pro, that this guy is close to natural, he looked amazing but of course didn't place well. They were like wtf is this guy talking about?

If you look at Mike off-season at that time he wasn't anything like "off-season" now. He was small and looked less saturated = less drugs. Even you have to admit that it's very strange the amount of muscle he put on decades later if he was supposedly natural all along, it's just not possible without a lot of drugs. Not a little, a considerable amount. A looong time on GH.
First I saw of Mike was some deadlifting pics at Gold's Venice, some "monstrous" 700lbs IIRC on sumos in a deadlifting suit. Can't locate them now.
No delts = nachuralo, little drugs. Later on, come on, man

No natural has a jacked delt/trap complex, just doesn't happen. Even on something like rear delts specifically you can immediately see if someone might legitimately be natural.