Thread:Bratpack/@comment-112155-20140822121143

Answering your question about the difference of status between Weaver, Tad, and Callie Hannigan, the reason is that, as with other characters, their status is based in their last appearance or mention.

Weaver last appeared in episode 16, and her status was unknown as she was under siege. Tad and Hannigan las appeared in episode 12, and they were alive and well. Nothing confirms nor denies they were at the academy.

Every character could have died after his last appearance, an exaggerated example, Roger from episode 9 could have suffered a heart attack the following day, but we cannot know.

That's why this and pretty much every wiki about similar subjects (films, tv series) lists the status of their last known appearance or mention. 