Every year there’s a number of 58-59:xx East Africans whose focus is running 2-4 high profile halfs. Typically they do this for a couple-three years before either slowing and switching to running 2:09-2:13 ‘B’ level marathons for prize money, or run so well that the marathon majors draw them in. Dennis Kimetto was one of these guys. Kibiwott Kandie was one in 2019-20.
Kandie’s 2020 results (ALL his listed results):
2/21 RAK 58:58 1st
9/5 Prague 58:38 1st
10/17 World 1/2 Champs 58:54 2nd
12/6 Valencia 57:32 1st
And there are guys doing it this year too, just no multiple-sub-59 guys yet. Keneth Renju, Alexander Mutiso, Benard Kimeli, and many more.