Firstly I'm deeply shocked by Kelvin's tragic passing. its very sad.
I can't think of any parallel story that touches it to be honest. He was already a superstar within the sport, on course to transcend and become a historic figure comparable any sporting icon you care to mention, if Sub 2 were to be recognised as a legitimate WR.
Its like if Maradona had died just prior to 86 or something. Nothing I can think of comes close.
Sammy Wanjiru?, maybe..he likely would have had the career Kipchoge ended up having.
Ayrton Senna?, maybe, but Schumacher would still have been the man.
Pre?, a lot to admire but i don't think he was set for global domination.
Duncan Edwards? before my time so hard to know, potentially.
Dwayne Haskins? would have had a decent career but not totem for his team let alone the sport.
Len Bias, if the 30 for 30 is to be believed but who knows.
I'm sure there are loads I'm forgetting but Kiptum is out on his own for what might have been.
I think this puts sub 2 back 10 years at least. Shoe tech or no Shoe tech.
its a terrible tragedy.