User blog comment:Llama919/Possible Beast Titan Identity?/@comment-5774380-20150618200119/@comment-26509561-20150620112048

You're absoulutely right about the hole thing, so it isn't impossible to escape. That has been the only noted occasion when someone tried to escape so up to this point i think its appropriate to make this assumption.

Even so, i couldn't think of any other character who could have escaped through that hole, being an "unofficial death"

This is my first theory as well and from what i've read you've made an excellent first post. But you should proof read your post and all the spelling mistakes (if only wikia had spell check) since theories have to be thorough.

I think i might edit this blog post and copy all this info from what you and manuel have provided :)