Can we be clear about one thing though?
Daniel Bard is a match for Chamberlain in the stuff department. He's a little behind on command but that can develop, and he's miles ahead on mechanics and body type. In other words, it's reasonable to compare Chamberlain and Bard.
Bard also wipes the floor with Chamberlain in the attitude department, for whatever that's worth.
Also, one other thing, Duchy does have a point about FIP. While also being extremely talented, Chamberlain got away with a lot of stuff that year, and there were some times when Rivera bailed him out. I don't think you can look just at ERA and say that Chamberlain's debut season was more impressive than Bard's. Especially since Bard is going to pitch more over a longer period than Chamberlain did, and he's probably going to earn his way into a setup role over more talented pitchers than the Yankees had to work with in '07, which should be more impressive to those keeping score. Also we don't have to mollycoddle our guy. There's no "Bard Rules." Bard just rules, and will come in whenever you need him. That consideration should at least be a tiebreaker with all else equal.