where did these guys live between 2001 and their entrance into the US?, and when did they enter the US?
As of right now, all info indicates: These guys GREW UP IN MASSACHUSETTS for the last decade!! They were fluent (at least conversationally) in Russian and Chechen languages.
Their parents, community and religious leaders need to be investigated, and their online connections to Chechen Islamists and Chechen "freedom fighters"/terrorists needs to be investigated.
Putin has wanted to invade Georgia for a decade, this all may give him international cover to do just that.