I definitely think that Calculator is involved. Personally, I love the whole "Oracle for the villains" concept. Meltzer has played that beautifully!
Unless it's another red herring (like Dr. Light and Slipknot), Issue #3 gives us reason to believe that Captain Boomerang killed Sue Dibny. Let me rehash the dialogue from panel 4 of page 32.
Quote: CB: Listen, before I go in -- you got any extra jobs that need... y'know...? C: Digger, be serious. You're not exactly in your prime anymore. CB: I can still toss 'em like I -- C: No one's gonna hire you, Digger. Not after what your did with -- CB: I was just trying to prove I still had it. C: Yeah, well... if you wanna do that, you have to go bigger than-- CB: I need the money, Noah.
Coincidence? Maybe. But I still think that these guys know something about what's going on. Otherwise, why feature them so prominently?