WHO ELSE IS HAVING A JAZZY FREAKOUT??? WHITE WINE PLZ

It was veeerrrrry sneaky of Carrie to sequester Jessica and her perfect tits with hot Mike. She knew they'd fuck.

I understand the TV mechanism of making things convoluted and then making it seem obvious that Peter would be tasked with killing Brody, but I don't understand why the FBI would suddenly get involved or what's gained by killing Brody at all. It's just another wrench in the mix.