Its the roster. There's just really zero talent. Their last try hard game of the season was New England. with an undermanned, weak roster...i'd expect this team to mail it in the rest of the way. They know they can walk over Rex, as performance doesnt seem to result in benching...considering Sanchez is still playing.
It's not talent on special teams. There is plenty enough talent for specials. The problem is that they are doing what you guys want. They are working in more rookies. With less vets involved you get more miscues. Due to injuries, an attempt to use rookies and guys that aren't normal special teamers (Tebow)you get more mistakes. Davis and McIntyre botched McCourty's return against the Pats. One 15 yard penalty was Dowtin's hitting the QB in the face on what was a good pass rush.