Callahan comes up because the same people who claim that Dubinsky was worthless or a third liner are generally the ones who claim that Callahan is a first liner. If you have watched them over their careers, you can easily see that they are similar players. They play the game with the same kind of intensity, put up similar point totals, and they always seemed to up their game when they played on the same line.
The general path of discussion (a path that is well-worn on this board) looks like this:
Anti-Dubi Crowd (henceforth, ADC): Dubinsky was nothing more than an overpaid 3rd line scrub who didn't make the jump like Callahan.
Pro-Dubi Crowd (henceforth, PDC): Um, Dubinsky put up more points than Cally in almost every season).
ADC: HE WAS OVERPAID! YOU HATE CALLAHAN! DUBI NEEDED TO SCORE MOAR GOALZ!
PDC: No, we are saying that they are similar players, and that production was similar.
ADC: GOALZ!!!
Three or four weeks go by, and the process repeats itself. I'm still convinced that most of it goes back to Dubinsky's contract hold-out (if you look carefully, you'll see that most of the ADC bring that up at some point in the discussion). That's why I'm worried about how Stepan starts the season. If he struggles in the first few weeks, I can see him getting the same irrational treatment.
Dubinsky had a down year, and he's not a goal-scorer. That combined with his short holdout made him public enemy number one for many on this forum. For those of us that are a tad more rational, we just can't understand how the same people can think Cally is a demi-god and Dubi is trash. They are cookie-cutter players in almost every meaningful way. That's why Cally gets brought up. Not to put him down, but to use him as a comparative to point out the hypocrisy.