Board Thread:Misc./@comment-28958062-20170825191100/@comment-28958062-20170826080235

...It was weird to have Connie, Sasha and Historia playable but strangely all other titan shifters weren't...

It wouldn't even have been that hard to implement them as all models were already in place, it would have made sense if they didn't include their titans or if Annie's character was unlockable only after the main quest was done.