You have to be kidding me. You really don't understand what I am saying at all, do you.
There is a difference between being world class and then for the talented few who can rise above that to be historically great performers (WR holders). Coe is actually an awful example to give here if you want to dispel my opinion/hypothesis. The one data point you have that you think have to validate your counter is the 3.29.77 in 1986.
Coe's window was 1979-1982. 4 years. This was when he was at the absolute peak of his athletic ability. The 3.29.77 performance from 1986 (which even then was an outlier for Coe because his next best performance from 1983 until that run in 1986 was 3.32.12) a) wasn't the WR and b) simply points to him being able to really obliterate that record and have it down under 3.29.0 well before even Cram or Aouita came along - but unfortunately he quite simply didn't. There is zero other evidence you have to support Coe having this "WR ability" from 1983 to 86. I mean in all honesty did you even look at any numbers? His WA profile is quite complete and it's all there.
The 3 WR's he set in his career all came in 1981. 1.41.73, 2.12.18 and 3.47.33. And when you look at this season he only ran once over 1500m - the (in)famous 3.31.95 in Stockholm where the pacing was poor and absurdly fast - 52.43 (with him at maybe 53.3), 1.49.18 (him at 1.50.0) - so he basically ran it solo going 53.3, 56.7, 58.3, 43.6 for 3.31.95 which clearly in a sensibly paced race points to something in the high 3.28's especially with him being in sub 1.42 and sub 3.48 mile shape.
In 1983 his bests were 1.43.80, 3.35.1 and 3.52.9. In 1984 1.43.6, 3.32.4 and 3.54.6. 1985 1.43.07, 3.32.13, 3.49.22. And in 1986 1.44.10 and 3.29.77 (no mile performance). Again, all that one -off 1986 performance proves is that Coe was capable of so much better earlier in his career. The fact that was a massive outlier performance for him and it still didn't break the WR validates my opinion more than it does yours.
Saying "well he was injured/sick in some of those seasons" is irrelevant. That is part of the game. The reason you get injured/sick is because you push your body beyond it's limits and if you are at his level, the level of training needed to be a WR contender isn't long term sustainable.
By the way, you talk about these "well known athletes" in plural. Who are they? You gave one guy.
El G 1998-2001 (he did run 3.26.89 in 02 but not sure he was a legit threat for that record like when he just missed it in 01). Morceli 1992-1995, Rudisha 2009-2012, Kipketer 1996-97, Komen 1996-1998, Bekele 04-08 across the 5 and the 10. I could continue for a while - who do you have other than Seb Coe who doesn't that criteria anyway, aside from it being your opinion?