He sure did. Notice how Wiggy had to have a quorum at all times when Jackie quit. His “quick wit” suddenly vanished. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jEsUu1xShR0.html
It's probably lots of Fred too... you can hear the same kind of material when Evil Dave comes on , which was after Jackie. It's the same kind of stuff that reminds you how funny these guys are.... ALSO which is a hint that it's not all Jackie.