Rojo, you have to acknowledge there is some inconsistency to your hunches/thoughts. With Mo Katir, you strongly hinted that you rooted against him because you think he's a doper.
What is more plausible:
Barely supported athlete (who ran 3:40 at age 20), aged 22, shows some real promise during the Pandemic and runs 3:36.5 and 7:44. With those results, he's able to train at altitude where the Ingebridsten camp does, get a coach, put on the Asics supershoes and he has a huge age 23 season with some monster marks, but ultimately falls well short of an Olympic medal.
Athlete in her 4th pro season, age 25, after a high-profile college/HS career with strong resources throughout suddleny morphs from a US-level 1500 runner and a good enough to make the team at her better event (the 5K) morphs to a DL-winning one (3:57 with monster kick) at the 1500, and drops huge times including 14:23 without the superspikes. Chalks it up to slightly higher mileage (but she was running 60+ as a senior in college) and better nutrition (in retrospect funny).
Yes, I know you'll want to compare this to Fisher/Cranny, both of whom were HS phenoms at the 1500/mile (unlike Houlihan), and were purposely undertrained at Stanford. They also now are 5,000/10,000 runners, and while Fisher could * maybe * run 3:33-3:34 and Cranny has run 4:02, I don't see the Shelby-type massive drop at 1,500 which was honestly the most unusual part about her progression.
I could toss Josette Norris into this as well.The reality is few runners make huge jumps in the 1500 meters in their mid-20s and later. It is a large red flag unless there is a huge injury history. It's not a late-blooming event.