My opinion is this. Whatever he has or doesn't have physique wise has to do with genetics primarily.
Yes there are stronger steroids than EQ and Deca but doing them would not have magically added 20lbs of pure muscle during prep. All steroids pretty much work the same way, some are more potent on a milligram basis basically. There are some differences but relatively minor in the big scheme of things.
1600mg you guys say is a crazy dose, yet also weak as shit... which is it, was he on a lot of drugs or was he on mostly inert compounds that didn't help him at all? If Sev had put him on test, tren, masteron, anadrol, t3, clen, DNP, GH and insulin and the guy would have looked more impressive you guys would have cried about the excessiveness of it all, despite great results.
As far as what Junior says about going low carb or keto for long periods being bad... I thought this forum was a big supporter of low protein, only eating when "needed", fasting whole days frequently, never eating either before or after training, doing whole body training everyday, adding in lots cardio such as cycling... which results in ZERO muscle loss even with very low anabolic intake. Galeniko and no one style.
So, what exactly is the major mistake the guy has made?
Sure, if I had done his prep I would have added a bunch of drugs, different drugs but then I would have been accused of trying to kill the fella.

Even some Clen would have been wonderful the last 3 weeks.
