What is the Lions' deepest position group?

Just four or so months ago, the Detroit Lions had several holes to fill on their roster. They had to find a new running back following the release of Reggie Bush, for example, and basically the entire defensive tackle position had to be restocked after the loss of their top four players. Positions like left guard and cornerback also had some holes that weren't filled until the 2015 NFL Draft.

Now, as training camp nears, the Lions are pretty much set from a roster standpoint. Perhaps they could use a bit more depth at a few positions here or there depending on the health of certain players, but overall, there aren't exactly any major needs remaining. As a result, we have a pretty good idea of what the roster will look like going into camp and the regular season.

Of course, things could always change as injuries begin to pile up. If a player goes down at a position like defensive tackle, for example, that would create a major hole and a need for outside help. The Lions currently have a known top four of Haloti Ngata, Tyrunn Walker, Caraun Reid and Gabe Wright, but even one injury could decimate their depth at this position.

On the flip side, certain positions are built to withstand injuries, even if they happen at the top of the depth chart. Just look at the linebacker position. The Lions lost Stephen Tulloch to a torn ACL in Week 3 last year, but Tahir Whitehead stepped into the middle and kept things afloat. This year, the Lions have Tulloch back, Whitehead returning to the strongside spot and DeAndre Levy remaining in the weakside spot. In addition, they have promising young backups in Kyle Van Noy and Josh Bynes, plus experienced special teams players like Travis Lewis and Julian Stanford. They also have another player with some serious potential in Brandon Copeland.

All of this is a long way of saying that the Lions are extremely deep and extremely talented at linebacker. For my money, it's the deepest position on the Lions' entire roster going into training camp. The Lions have five linebackers who could potentially see significant playing time on defense over the course of the season, and they have good flexibility among their starters as well, which really adds to how much depth they have at the position.

What do you think is the Lions' deepest position?