So this is how PFF gets their DT rankings:
I don't agree with that methodology at all. At least I understand where you are coming from.
On the Pro Bowl, sure, you can find a few exceptions here and there on players that shouldn't get voted in that do, but for the most part, I think you can find a lot more exceptions on PFF stats. Take, for instance, the 80th overall ranked DT Ahtyba Rubin, who had 45 stops, 8 more than the 2nd best DT in stops. He was also ranked 142nd in run defense, even with all of those stops. I'm not sure how that makes any sense at all.
PFF is wildly inconsistent. In 2010, when the Packers won the Super Bowl, Rodgers was rated 5th best. Of the 4 QB's rated above him, only Phillip Rivers had a better passer rating. Tom Brady was 8th according to PFF even though he had a passer rating of 111.0. For reference, Matt Ryan, who was 2nd according to PFF, had only a 91.0 passer rating. That's a 20 point difference. So yeah, I really question these stats.
About Raji, it's not about just the Pro Bowl season. I also referenced his other 6.5 sack season. Also, just look at how much worse this team gets when Raji is not in there. Today was better, but the first 2 games were terrible on defense.