User blog comment:Gourgeist/Who Is The Beast Titan?/@comment-25472766-20141005053628/@comment-25448721-20141006054954

(Stealing the idea from the blogspot blogger I mentioned)

Normal titans still attack the titan shifters, even when they're transformed, but they don't attack the Beast titan at all, so that's why I don't think the Beast titan is a shifter.

Read the blogspot post and tell meh what you think! It's so awesome ^_^