I read as manly as 200 attackers in the over 500 links I have covered in the past few weeks.I also heard/read the “annex” was a CIA headquarters.
Estimates between 125 - 200 attackers isn’t really a wild disparity given an attack in the dark of night that took place ranging over two locations and consisting of three waves. I don’t think it was news to the locals that the CIA was operating out of the “annex” but any doubt was removed in the House Oversight hearings.