Another week, another huge performance from . I have nothing else to say about that. The man is just good at football. He's not only IDP gold, but I'm lobbying to be able to put him in my regular lineup as a flex. On to the rest of the IDP roundup for the week.What in the name of St. Louis-style barbecue is going on with ? Last season, the defensive end was a monster on the field and in fantasy with 19 sacks. In the end, he finished Chris Carpenter Jersey tied with as the best defensive lineman in fantasy. This year, we're waiting for Quinn to record his first quarterback takedown. I'm not joking. Look it up, I'll wait.It's not just Quinn, actually. It's become an epidemic throughout the roster. As a team, St. Louis has just one sack -- thanks, ! -- which is an NFL record low through the first five games of the season. So what exactly is the problem?Part of it is a lack of . In 2013, the other bookend pa s rusher accounted for 8.5 sacks and created more worries for opposing offenses. This season with Long out after ankle surgery, St. Louis hasn't yet found an equivalent. In the meantime, opposing pa sing games are also getting the ball out faster. Jsut watching film of St. Louis' last two games, neither nor held on to the ball very long. That doesn't allow Andrew Miller Jersey Quinn or his teammates much time to get to the pa ser.Finally, there's just a little bit of bad luck involved. There have been a couple of times when Quinn has gotten his hands on the quarterback, only to have the QB throw the ball away before going to the ground. Watching Quinn rush shows that he's certainly going hard after the quarterback and it's hard not to think that he could start getting sacks in bunches. While this is definitely a head-scratcher, he's too talented for it to continue for much longer.Beware Burfict's injury situation is starting to become a little worrisome. The star linebacker has already mi sed two games this season while dealing with concu sion symptoms. Then he was forced to leave the Week 6 game against Carolina after helmet-to-helmet contact. While he Enos Slaughter Jersey did return to the contest, it's concerning that he's had to deal with so many head injuries in such a short amount of time.There's little doubt that Burfict is a game-changer when he's on the field. Look no further than the 8.50 fantasy points he tallied this past week. But with the number of head injuries beginning to add up, there's always the chance that Burfict could be lost for an extended period of time. As long as he's on the field, he should be in your lineup, but it's also a situation worth keeping a close eye on.Four downs The will Mark McGwire Jersey play the rest of the season without . The linebacker was placed on with a knee injury, robbing New England of the man who was its quarterback on defense. Similarly, fantasy GMs will have to replace a player who was among the top 10 at his position and on pace to return to his 2010 form when he was tops among fantasy linebackers. Undrafted rookie is likely next up in Mayo's spot, but don't expect anywhere near the same level of production. was forced out of Monday night's game against the with a after awkwardly jamming his foot into the turf at the Edward Jones Dome. The severity of the i sue isn't yet known, but if Willis is forced to mi s time, it would be another big lo s to a defense that is already thin. and have done yeoman's work filling in for a battered corps of linebackers, but neither one of them can fully replace Willis if he Chris Beck Jersey has to mi s time. linebacker could be out of action as he deals with a i sue. At the moment, the team isn't sure how serious the injury is or how long it could keep Wagner off the field. is listed behind Wagner on the depth chart, but could also potentially slide into the role if need be. The will have linebacker back at practice . The rookie hasn't played since Week 3 because of a knee injury and it's not certain whether he'll be ready for the Week 7 contest against the . With Pittsburgh playing on Monday night, the extra day could help Shazier, but this probably isn't the week to stick him back in your lineup.Marcas Grant is a fantasy editor for NFL.com. Follow him on Twitter .