There are times when players mathematically achieve a high ranking even if they really have no business being there:
Bjorkman was #4 in 1997
Corretja was #3 in 1998
Enqvist was #4 in 1999
Norman was #4 in 2000
Corretja is arguably the greatest clay court player without an RG, Enqvist was a phenomenal striker of a ball, far more talented than Johansson and Norman reached the RG final.
Did you even watch these players?