Along with other top guys from that era that are not in that pic... Kevin Levrone, Michael Francois, Aaron Baker, Vince Taylor
Also, Priest, Yates, Dillet, Sarcev, etc. And if you push it back to the early 90's, throw in Sonny Schmidt, Porter Cottrell, Ron Love, Haney. Now I am not saying every single one of these bodybuilders is better than Phil. However, the amount of quality bodybuilders that he'd have to get through before being number 1 is a lot greater than today.
Phil Heath would not even be in the top 6.