Apparently, Pat had some health issues a few years back that manifested themselves in the form of hives - when he was able to get up, it was only to go to the emergency room. They had him on Prednisone, which, coupled with the inactivity, caused him to balloon up to 350lbs. Since that time he's dropped about 80 lbs. I had not even seen pics of him in years, so when he walked out onstage this past weekend, I was shocked. Great show though. Free, too!
(BTW I like the consistency in their wardrobe)