The Detroit Lions were back at camp on Sunday, and there were some big things to talk about right off the bat. The biggest story was obviously the loss of Levi Obwuzrukie for the season. That's a hard blow.

With Taylor Decker on the PUP list as he recovers from what head coach Dan Campbell termed a "clean-up" on his shoulder, veteran Dan Skipper took the first-team reps at left tackle. Jamarco Jones was the second-team LT, followed by Giovanni Manu.

The Lions training camp has begun. Here are players and key position battles to watch -- and a 53-man roster projection.