The thing about Walt and this isn't going on spoilers, but the Actor who played Walt really had a growth spurt when he hit puberty and is now 6 feet and change making it very tough to bring him back.
Warning spoiler on Link
On DarkUFO
http://spoilerslost.blogspot.com/201...#axzz0jmOcTg7Z
Sources who have either read the full scripts, seen the video dailies and/or final post productions of some of the episodes put there ratings up for future episodes. It's incredible how close they've been to the ratings given by viewers after the episode has aired.