Probably because in Aouita debut over 26 years ago and only 10000m he ran 27:20 which was around 10 seconds off the world record, is over 15 seconds faster then Alan Webb's 10000m pb.
I don't know why we can't support/praise both of the runners for their incredible versatility from 800m to 10000m! It probably will be another 26-30 years til another runner of Said Aouita and Alan Webb versatility comes along!