Marr went off and played with the pretenders and the the and other bands. He didn't form his own band until much later. Besides, Andy still had the moz gig for a couple of years.
Remember that Andy is a bassist and so his interest is in the rhythm aspect of songs. It lends itself pretty naturally to djing where the music seems to be all about an infectious beat. He plays whatever is popular and puts together his own remixes, which never seem to include Smiths songs. The part about getting absolutely pissed is pretty accurate....
Thanks for information about Rourke's djing...have you seen him as a dj?