#4 To protect Mysterio and not have him take a pin
There's very little chance that Daniel Bryan is dropping the WWE Championship at the Elimination Chamber. I mean it's not long ago that he became Champion anyway. Moreover, he's been extraordinary ever since he developed into this devious, annoying heel character.
These are two reasons why I think that Daniel Bryan will not be dropping the title at Elimination Chamber. And that's not all, he has introduced a brand new title and it makes no sense for him to drop the title so soon after introducing it. So it's more than likely that he will come out on top at the Elimination Chamber pay-per-view.
This potentially means that Rey Mysterio may have to take the pin if he were to enter the Elimination Chamber. Because he's already been defeated by Andrade clean, WWE may want to protect him by not having him pinned yet again.