While expandos is formulating his take, I'll offer up what I have dedueced from listening to the news all day.
#1 goes over Russia gets radicalized and trained. Meets up with sleeper cell in MA. Gets little brother involved. That shady mechanic says #2 starts hanging with different crowd with more money(sleeper cell fellas), #1 and #2 plant the bombs, return back home, sleeper cell is gone and they are left high and dry...and on tape. They both freak the fuck out when their pictures are posted. Roll the 7-11 for cash, shoot cop for his cruiser, ditch the cruiser car jack someone, LET CAR OWNER GO ALIVE, get into fire fight when cornered. #1 taken out. #2 GTFO of there.
Either he is hiding goes out in a blaze, turns himself in or is gonna get popped by sleeper cell before turning himself in. If the first or last, we'll never know if anyone else is involved.
-From ALL account #2 was a nice regualr kid, prior to his older brother getting him involved.
-He's scared shitless without his older brothers influence.
It'll be interesting to see what if anything comes out from what went down during the 40 minute car jacked hostage and if this kid turns himself in alive.
Police aren't saying shit about anyone else involved except these two, but the entire Boston Metro is in lock down?
There you go expandos, run with it!