If you can't get some playing time on a team with this many injuries and this many weak spots, then you're just not getting something. Maybe he can't learn the playbook, maybe he isn't catching on well with teammates, maybe he's just working through too many nagging but no debilitating injuries. Maybe he's a meathead that can hit someone right in front of him, but can't actually be part of a system.
Who knows?
I do know, though, that at this last moment of the regular season, if you aren't getting used, then it's because they have little use for you.
They used to keep guys like this as a wedge buster for kick offs....