Calculate yourself, amount of the characters who had relevancy in sone ways are not more than 200, ninja war had 40.000 fodders. relevant characters are always above generic fodders regardless of rankings common occurence in fictional world.
200/40.000 = 1/200, which means 0.5 percent. Most named characters are well above generic fodders (Save it for the likes of Moegi, Udon and non combatant Karin), so yeah almost anyone we knew from NV can solo 99.5% of NV. Just counting the current fodders. Add past fodders and number increases.