Moh Ahmed had a 13:34 pr at 20 and did not break that until he was 23 when he ran 13:18.88. The next two years he ran 13:10 and then 13:01. He then fell back again (13:08 and 13:03 the next two years) before breaking through to 12:58 in 2019. The next year he ran 12:47. 13 and 34 is a 47 seconds drop from normal age college times.
Chris Solinsky ran 13:42, 13:37, 13:27 at 19 through 21. Finally, as a pro in Europe after his age 22 college season, he ran 13:12. After two subsequent 13:18 years he ran 12:55. That's a 32 second drop from college, or at least from his junior year pr.
Those are Jerry's athletes as well, sure. But what about Dathan Ritzenhein? At 18, he ran 13:44.7. At 19, 13:27, a 17 second pr. He regressed the next two years, 13:39, 13:52, before running 13:22 at age 22. In 2006, he pr'd with 13:16, ran 13:16 again the next year, and then two years later dropped his pr 20 seconds in one go to run the American record of 12:56. That was a 26 second drop from college. Sure, he's a Salazar athlete.
How about Josh Kerr then? He ran the college record of 3:35. Since then he's dropped 6 seconds in the 1500m, which is like a 20 second drop in the 5000m.
Big drops happen from collegians because they are in school and usually don't or didn't in the past get a lot of opportunities to run fast paced races.