Too many too big plot holes

1) If one of the girls escaped, it is evident the police will soon be on your heels. Aunt could have easily returned Anna to the pit but she didn't.
2) If Alex disappeared after Keller all of Keller’s yelling to the police he was guilty, wouldn’t that raise suspicion. Only when the detective discovers Keller’s absence from home late at night does he decides to follow him, and foolishly gives himself away when he doesn’t pull over to let the garbage collector pass.
3) Keller discovers the police is following him, that he knows where he was heading but didn’t change his plans. Next, he is found in his secret quarters and was extremely close to be discovered, yet he did nothing about it.

HAS ANY OF YOU NOTICED THESE FLAWS OR HAVE I COMPLETELY MISSED THE POINT?