You have to show somebody the definition of the greatest KO, Which fight do you refer to? Whether it because its brutality, its significance, the power or just the technique leading up to it. Which one KO would you pick?
When one factors in quality of the fighter kayoed I think it boils down to a few select candidates: Hearns-Duran Marquez-Pac IV Foster-Tiger Marciano-Walcott Nunn-Kalambay Abraham's deboning of Khoren Gevor might be the most grotuesquely violent knockout I've seen, but Gevor is nothing special. Same for Darnell Wilson-Emmanuel Nwodo Gatti's ungodly combination on Gamache is also sickening, but it sufferings in the standings for the reasons above.
for brutality : frenkel ko'ing maccarinelli for technique : robinson ko'ing fullmer for pure power : jackon ko'ing graham