[Windflier]

The younger brother probably knows some stuff, but obviously the older brother was the leader for the operation.

Given that we know next to nothing about the planning and execution of this atrocity, how is it "obvious" that the older brother was the brains of the operation?

[palmer]

Older brother joined jihad in 2009 (according to Uncle). Older brother had 6 months of terrorist training. As far as we know the younger had none. The old brother ran into gunfire, the younger surrendered. The older brother studied engineering, the younger was pre-med.