Good article... only thing I didn't like is the "BJ Penn ranks the highest from a P4P perspective of all teh Champions" line. GSP and Anderson both out rank him IMO, not to mention GSP even BEAT him...
I agree with Chileandude's post. I think their talking about BJ as a 155 lbs fighter. But I can also some what you're saying. For example people use the fact BJ went to a decision with Lyoto as a heavy weight as a reason to cement his P4P status, but when he lost to GSP at 170 they discredit that fact.
But overall, I would say Anderson, BJ, and GSP are pretty much equal as P4P fighters but BJ is really a monster at 155.....and so is GSP and Anderson in their respected weight classes.