Doping is involved, but for once it was a case that went the other way. At the time of the '90 World Rankings, Borut Bilac of Yugoslavia was under suspension for a drug bust of some sort. Accordingly, we ignored him in the deliberations.
After a protracted period, Bilac ended up being cleared of all charges. Acccordingly, we went back and recast that portion of the Rankings. Because of interaction between Bilac, Alli (originally No. 9) and Gordon McKee (originally No. 10), the won-loss formula changed, so the unusual happened in that McKee went up to No. 9, Bilac became No. 10 and Alli dropped to 11 and out of the picture.