Supposedly, the guy in blue has a facebook account, and is a marathon runner who missed the race. I did see one picture of him posing in the same jacket for a picture, with a Boston Marathon poster/tarp behind him. Highly unlikely to do this if he was behind the bombings.
More interesting individuals posted.
Sounds like a great cover to me. Missed the race but was able to be at the finish line only 2 hours into the race ( probably earlier ). Don’t think people who run marathons are the type to oversleep