True, Blazedboy.
I'll answer in a round about way then. I think the last of the four to win a slam will be Justine Henin for two reasons.
First, she seems to be falling into the shadow of Clisters, and this could create some sort of mental block that could affect her play against all of the top players. Second, her playing style seems to place her on surfaces where the best players also perform best.
Momo and Clijsters seem to be more capable on clay so they'll avoid much of the keen competition found on other surfaces.
Dokic's training appears to have worked. I now believe Dokic will be able to hold her own against the top players.