well, initially it was cBob with the idea and concept, and he hired Marty as artist. that's quite a few years back, and by looking back at old posts from here, i think they developed some kind of hm, compatibility..? rather fast. now, this little project grew into something comparably large, and if projects grow they become work, as in, full time jobs at some point.
i somehow doubt (well, that depends on cBobs recovery to a big degree) that they just call it quits and go on with life being bus driver or janitor, strangers to eachother.. just doesn't form a picture in my brain.