I'm sorry, but your example of Coe running 5 WR or near world record times in one season is not in the same league as what the likes of El G and Ngeny were doing 20 years later with EPO on tap.
-For a start, there is a huge difference between recovery for a fast 800 and a fast 1500m. Of those races Coe ran his fast 800m many weeks before his fast 1500/miles.
-He ran a fast 800, then had 4 weeks between his first fast 1500m. He then broke the 1000m 4 days after that.
He then had another 6 weeks to get ready for a couple of assaults at the mile. He was really disappointed after the botched pacing job in the Stockholm 1500, because he stated that it was only possible to have a few peaks in a season and that was his only attempt at that record.
Those fast 5 races were part of a season of 26 races (not including indoor). After his first WR in June, he ran 14 more times.
Now let us look at Ngeny for comparison: I couldn't find El G's list of races, so Ngeny is the 2nd best example. Let's look at his 1999 season:
13.06.1999 Villeneuve d`Ascq IAAF-Permit 1500m 3:31,12 (1.) +2,33s;
16.06.1999 Athína 1500m 3:31,32 (1.) +0,82s;
02.07.1999 Lausanne Athlétissima / GP 1500m 3:31,18 (1.) +2,72s;
07.07.1999 Roma Golden Gala / Golden League 1 Mile 3:43,40 (2.) -0,27s;
17.07.1999 Nice NIKAIA / GP 1000m 2:12,66 (1.) AR / +0,90s;
21.07.1999 Paris Gaz de France / Golden League 1500m 3:28,84 (1.) NR / +2,07s;
30.07.1999 Stockholm Dagens Nyheter Galan / GP 2000m 4:50,08 (1.) +5,12s;
04.08.1999 Monaco Herculis / Golden League 1500m 3:29,79 (1.) +0,82;
11.08.1999 Zürich Weltklasse in Zürich / Golden League 1500m 3:30,28 (2.) -1,71s;
24.08.1999 Sevilla World Championships 1500m 3:28,73 (2.) NR / -1,08s;
03.09.1999 Bruxelles Memorial Van Damme / Golden League 1500m 3:29,19 (1.) +2,90s;
05.09.1999 Rieti (ITA) Rieti Meeting 1000m 2:11,96 (1.) WR / +2,45s;
11.09.1999 München Grand Prix Final 1500m 3:28,93 (1.) +3,37s
13 races in longer distances (compared to 800m) in a season of 18; from the point he ran his first 'super fast time'. All his times over 1500m and a mile were faster than Coe's best times in 1981.
The longest 'rest' period between any two of those 13 races was 2 weeks. 5 of them occurred within just over 3 weeks!
The sheer number of fast times and close proximity between each, not to mention the ratio with only a handful of slow times, outweighs Coe's 81 season, considerably.
Coe's reflects a carefully prepared and targeted season of a few fast races interspersed evenly throughout.
Ngeny's represents a total, unfettered binge of fast times practically every time he raced. A similar pattern would be seen with El G and Lagat during this era. After 2004, who else had season's that compared in quality and quantity with Ngeny's 99 season? I can't think of anyone, not even the convicted dopers of Ramzi or Kiprop.