I think Dave should appear from time to time, but if he was on with Chris every day, it could get a little too much like the radio show, which would be alright at first but could get a bit repetitive.
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I voted no - I think they need to do some stuff apart from each other so that when they do work together (i.e. on the radio!) the stuff is much more creative and enthusiastic, and therefore much funnier.
definitely should be somtimes, i mean after all its what they do best. if he was on everyday it would be a bit too much like the radio but i doubt i'd be complaining.