I thought no one picked him up because they were all too self-involved. Will shows up and helps them break out of that. Honestly I never watched too much of that show.
Regarding Roseanne, I thought you were going to talk about the show with Blues Traveler. Popper plays an old buddy of Dan and reassures him that he made the right choice marrying Roseanne and having a family instead of playing in a band. Then he proceeds to rock out one of their hits at The Lobo. I think Dan might even sing a number with the band.