I'm glad I didn't read that book. Calais was great, one of my favorites, but PP took away the other teams biggest receiving, likely #1 offensive threat every week for a number or years. QB's would rarely throw in his direction.
People just discount how good he was because, for example as you stated, he took down Cards logos on his instagram/twitter/whatever. That has nothing to do with how good he was.
As for the PED's, there a great number of players taking some kind of PED. I've been told this numerous times. PP just got caught. Btw, did they ever say what he was busted for? I can't remember.