Kedsy, I will disagree. First, I think you have been loose with the term PF in describing Mason. Mason played a LOT of C those years as Miles was largely a reserve and Kelly played PF. Second, how many of those PF had a dominant rebounder playing C alongside them? I suspect the answer is zero, with the possible exception being Laettner. We have had only a handful of seasons with a single player getting 8+ rpg, and never two in the same season.
So basically you are suggesting that one of the following things is going to happen:
a) Jefferson outrebounds Okafor, or
b) something that has never happened in the Coach K era is going to happen (two guys top 8 rpg in the same season)
I am going to say that neither of those scenarios is likely, and instead that the presence of Okafor and Plumlee and Winslow will eat too much into Jefferson's opportunities and prevent him from getting to 8 rpg. It seems much more plausible to me that Okafor will lead the team in rebounds, and by a reasonable margin. And that will mean that Jefferson, despite improving as a player, will see his rebound rate go down.