Hannity was asking Hemmer if he saw the photos that the police distributed and they both said it was the guy in the white hat and black jacket, and the other was the guy with the blue jacket and the full, round backpack. The police are searching for these two men.
My theory is "Approx 3-4 teams of 2." Redundancy protects the attackers against dud bombs, so they at least get 1-2 explosions by fielding 4 teams.
Here's another (possible/alleged) team. NOT the ones the media keeps referring to....
PUFFY COAT (dressed much too warmly; down parka; hat; possible gloves) and his partner BENDING GUY.
BENDING GUY is bent over (we see only his back/arms) messing with a very large bag/package on the ground.
BENDING GUY keeps fishing thru the package for awhile. NOTE: He's dressed in ALL-BLACK, just like (alleged suspect) seen on video running away full speed with his black clothes shredded from one explosion NEAR THE AREA OF THIS PHOTO.
Package happens to be within a couple yards (or even closer) of the 8yo boy that was killed. Also happens to be at "ground zero" for one of the explosions. I've surrounded them with THICK YELLOW lines.