Hard to argue with the list. I would add Mike Hartenstein to the list. Seems to me he was ABC defensive player of the year before there was ESPN.... Also, if Zettle puts together another stellar year, he may warrant mention on the list. I"m sure I'm missing a few others as well, like the top DT on the 1986 NC team.
http://pennstate.247sports.com/Bolt/Top-five-defensive-tackles-in-Penn-State-history-37996048
http://pennstate.247sports.com/Bolt/Top-five-defensive-tackles-in-Penn-State-history-37996048