I used to always say Grant Hill, but then he chose to stay in Phoenix. Maybe Kidd? not really on bad teams, but really haven't been threats to win it all IMO (even when Kidd was in the finals).
Probably one of the greatest ever offensive players but most sports fans just don't get the chance to see it because of being on a Mavs team that has never been able to get over the hump and get him any real help.....