I don't think the 7:20 wr is quite as amazing as people think. The run itself was eye watering but the time is not as untouchable as some think.
The 3k is an event that is not often contested and so is statistically weaker than the 5000m. The 3k is generally not a distance runners focus on (I think it should be). It is in the same boat as the 1k and the 600m. These events all have long standing WRs but are not actually that impressive, simply people don't really contest them. Komen ran his record pretty much solo.
I put ~7:20 equivalent with ~12:40.
So 13:00 is equivalent to 7:31.5
12:55 is equivalent to 7:28.7
12:50 is equivalent to 7:25.8
12:45 is equivalent to 7:22.9
7:30.9 is a 12:58.8 effort.
I think these numbers fit nicely with athletes like Bekele who was best at 5k/10k, not so hot over 1500m but then still managed a 7:25 3k. Same story with Geb. Then El G ran the WR over 1500m and won Olymoic Gold in the 5k (and a 12:50) and so was naturally a bit better at 3k than 5k with a 7:23.
Komen was the best 3k/5k runner ever and had a 1500m that was still very strong. He was no more a 3k runner than a 5k runner really. Kjelcha ran 7:28 and that is about equivalent to his 5k pb also.
Just my thoughts.