To be fair, a good chunk of that is mostly SNK/Capcom stuff with Namco/Sega being 2nd and third place, but even then, yea.... there are alot of fighters that nobody has ever heard of or even talks about.
Breakers Revenge, Fighters History Dynamite, and Outlaws Of The Lost Dynasty are just a few examples. The former made by a company called
VISCO, and the latter are two Data East games with FHD being that game that got them sued by Capcom and OOTLD needing Saturn hardware to play (which is self-explanitory as to why nobody has ever heard of it).