Watch the video of the suspects walking with their backpacks. One has a grey backpack and the other has a very light grey or even white backpack that he is swinging all over the place. The picture of the exploded bag right after the bombing was black with a white stripe on the hand tote right behind the neck. Looks like the suspects were there and probably in on it with a variety of other potential patsies (the billybob in red shirt and blue sweater, the Saudi's, and these two tennis player looking suspects). I know everyone thinks these SEALS are hero's and whatever but they are just ordinary men. They can be bought and or corrupted and the most obvious explanation would be that they were compartmentalized and running a drill that turned into a live situation. Keep in mind that the suspects were both dressed very much like the Craft/spooks/SEAL team.