User blog comment:Llama919/Possible Beast Titan Identity?/@comment-121.96.238.63-20150706164526/@comment-4929778-20150817161242

My theory is that this mission was planned years in advance, which is why RBA are experienced Shifters. The Colossal Titan had one purpose; destroy the wall entrance, the armored titan had one purpose; destroy the gates, and the female titan had one purpose; lure titans to the towns and destroy them quicker.