I think you have to look at track times and see that he is very fast but, other guys among the elite also run fast times i.e. 13:30's like thomas curtin and justin knight, and anthony rotich (among others I'm sure).
then there is edward cheserek who has run 13:18. i'm sorry but ches isn't just winning because he's the best racer. ches is also head and shoulders better than everyone, he just chooses to use his leg speed because nobody can match that asset of his either, and that is how he is most comfortable running championship races.
ches may even be so much faster at the end of races just because he's physically not as tired as everyone else and can not only kick, but straight up run full speed (which his full speed is still ridiculous). the only people that have beaten him are those who could run as fast as him like lawi, and jenkins if it were a time trial type race. Because those guys are only as taxed as he is, but sometimes not even that matters because he like I said before is extremely quick in terms of 100 meter dash speed along with having awesome aerobic ability.