I will give you some real life examples of what you are saying is interesting -
The riders who can't keep up with the pack in tour de france
The sprinters that don't make the olympic finals or for that matter the olympic team
Honestly at that elite level if they are using PED's it is probably 1/100th of the equation they already have something we never will; natural ability, drive, genetics, mental strength and years (normally decades) of hard training. It isn't the drugs that make them great athletes it's a combination of all the above factors.
Callans example is perfect no matter how much test & GH you jacked your not gonna bench 200kg unless you are 1) naturally gifted 2) built for benching 3) Trained for many many years. Don't diminish peoples achievements. Whether your Mr O a competitive PL'er, sprinter, cyclist the drugs don't make the athlete.
A counter-example for you. Prior to the mid 1980s, the IPF did not test for PEDs. At that stage, the IPF was pretty much it when it came to international powerlifting federations. It had the oldest record books and the most competitors (still has the highest participation). The introduction of drug testing was one of the factors that led to splitting into various factions of the sport. But a curious thing happened - the old records were never wiped - they stayed on the books.
In 2010, the IPF changed the weight divisions. Part of the reason for this I suspect was to indirectly expunge drug assisted records from the books.
If you look at the IPF world records prior to 2010 (when the weight divisions changed), you'll find most of the squat and bench records were set recently, due to advancements in supportive equipment. However, looking at the deadlift is the most interesting. There is very little to gain from equipment in the deadlift so it's more of a test of raw strength.
Most of the deadlift records were set in the 1980s before the introduction of drug testing and were never broken in the IPF. How sports have world records that survived for 30 years? one of the athletes that broke one of the pre-drug test records subsequently tested positive to steroids twice and was banned for life (Ed Coan).
The same thing can be seen after the introduction of drug testing in Australian powerlifting. There used to be one federation which competed in the IPF. After the introduction of drug-testing there was a split, thereby creating PA (IPF) and CAPO (WPC). PA wiped the records set before 1991 but they are still around to look at (because they are still on the CAPO record books). Most of the pre-drug testing records were never been beaten in PA before the introduction of the new IPF weight divisions and the old records were frozen. The talent pool never reduced - participation removed high, the coaching IP was still there, and the supportive equipment actually improved, but the pre-drug testing records were rarely beaten. I wonder why.
PEDs won't make Joe Average an elite athlete. But they will make an elite athlete a better elite athlete than he or she would have otherwise been. Which is exactly why anti-doping started in the first place.
In a pure strength sport like powerlifting, I am confident that PEDs have the potential to allow an elite gifted athlete to gain 10-20% over what they would otherwise be capable of.