Wait. They never explained how Doyle knew what the BAU were doing in 'Coda'. Or how Emily happened to have a submachine rifle and a flash grenade handy. Or who thought it was a wonderful idea to take a suspect to the rooftop to get sniped. Or who stuck their hand into the toilet bowl to get Emily's ring (I bet Rossi made Morgan do it.) Or the significance of Doyle's "Dr Reid".

Loose ends...loose ends...

More importantly...

What about Sergio?