I happened to be looking though the results of past world finals and picked up the name of Ukrainian, Grigory Khlinovsky finishing at number 5 in 1973. He had 10 points from his first four starts and but for an exclusion in his last race, might have finished up with 13 points and ridden in a three man run-off for the title. He had beaten the eventual World Champion in a previous heat so it's not impossible that he would have repeated that feat that in the run-off. Grigory Khlinovsky is certainly not a name that we see mentioned often but if he had not been excluded in heat 19, who knows?