Zook is top candidate according to Bob who is apparently speaking to the one veteran coordinator currently available (Joe Marciano).

http://www.jsonline.com/sports/packe...290711531.html

Also some non-specific blame passing:

"It also reflects on the head coach," one coordinator said. "They've done it a long time and haven't been very good. I guess you could lay it all on Shawn but they don't have great special teams personnel.

"Other thing, they've changed the assistants forever there. We used to laugh about that. They fire the assistants. Like, what are they doing that for?"
So is it the hiring and firing or the personnel? No one knows, they are just laughing.