Don't really see how Tim is any more normal. He's still failing to pronounce the names of well known actors and seems more interested in right wing politics than anything else.
Tim ended the last series with a bandage on his head (if I remember rightly). He also went through a bad divorce publicly, numerous times was mean and unprofessional to Gregg, was a disgrace on the Oscars special, dragged his new girlfriend into things - despite her obvious lack of movie knowledge, and even went as far as larceny.
Gregg on the other hand was always the consummate professional. His attempt at '500 in 500' was admirable, but in no way unachievable to a real movie buff.
Just based on this episode I'd say Gregg is the odder of the two and expect more in that vein. I won't be surprised if he breaks Tim's nose with a headbutt in the next episode.