I've watched some of the videos online. There is certainly enough doubt to cause suspicion on whether Lanza was either framed or he was part of it and there were multiple shooters.
Want to see an interesting piece? This doesn't prove anything per se, but it does raise suspicion. Watch this about CNN's use of Sandy Hook footage:
http://www.digitaljournal.com/article/341776
http://www.youtube.com/watch?v=xI0rBbLxYLo
This really happened. CNN used OTHER footage and not Sandy Hook footage. This raises a bunch of questions......