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Calvin Johnson (No. 81)
The (nearly) undisputed top receiver in football, all "Megatron" needs to do is get through training camp healthy and be ready for the start of the regular season. He has absolutely nothing to prove in the preseason.
Nate Burleson (No. 13)
Burleson surprised everyone when he made it back from his broken leg in time not only for training camp, but also for team OTAs back in May. He's months ahead of his recovery timetable and is back to being the same locker room leader he always was. He should start the 2013 season as the Lions' second option at wide receiver, but he probably won't remain there for the whole season.
Ryan Broyles (No. 84)
Broyles, like Burleson, surprised everyone with his early return from an ACL injury that he suffered last December. Unlike Burleson, though, Broyles should increase his production between now and the end of the season. In fact, the Lions might be looking to him to become the second-most potent option in the passing game—the "Welker" to Johnson's "Moss," if you will. But Broyles is still just a second-year player who was unable to complete his rookie season. Before he starts blowing doors off, he has to stay healthy and get himself fully acclimated to the Lions' offense.
Kris Durham (No. 18)
Durham is an interesting case. He played reasonably well for the Lions last season, given that he only joined the team for the final month of the season and had no idea what he was doing in the offense. Durham was a fourth-round pick of the Seattle Seahawks in 2011, one which the 'Hawks opted to give up on after only one year. In other words, there's plenty of room for Durham to be hiding upside, but he'll have to show major improvement in his first offseason with the Lions if he wants to stick around long enough to realize it.
Patrick Edwards (No. 83)
Seemingly one of the Lions' better undrafted player pickups in recent years, Edwards was impressive in last year's training camp and seems to have picked up where he left off. The key for him will be continuing to develop and staying healthy. If he can manage those things, his biggest hurdle will be forcing his way onto a roster that is suddenly thick with slot receivers. It might be a good idea for him to brush up again on his return skills.
Mike Thomas (No. 19)
Thomas tends to be easily forgotten on the Lions' roster, partially because he stayed healthy last season and was still a non-factor in the passing game. Despite playing in nine games for the Lions after being traded from Jacksonville, he caught only five passes for 28 yards. He was expected to be a combination slot receiver and punt returner, and neither has materialized thus far. Consider Thomas as another player who needs to take a huge step forward in order to justify a roster spot this season.
Michael Spurlock (No. 15)
Like many others in camp, Spurlock's usefulness to the team will likely be limited to special teams. In other words, if he doesn't become the Lions' primary return man, he's probably off the team. Nothing new for him—the Lions are his fourth team in the last three years, and his seventh since he entered the league in 2006, including two separate stints with the San Diego Chargers.
Devin Thomas (No. 11)
This is the epitome of "tire-kicking." Thomas, while only 26 years old, opted to retire last season rather than go through training camp with the Chicago Bears. While Thomas is listed as a wide receiver, he's not expected to make much of an impact as one. In 55 games since he joined the NFL in 2008, he has caught only 43 passes for 484 yards—and 40 of those receptions came in 2008 and 2009. At this point, he—like so many other receivers in the Lions' camp—should be relegated to competing for a special teams role.
Corey Fuller (No. 10)
Fuller may well become a valuable part of the Lions' offense, but it's unlikely to happen this season. He has speed and talent, but he needs a lot of work on his technique and route-running. Furthermore, there is a veritable logjam of players ahead of him. Fuller certainly has a shot at making the 53-man roster if he grows up really quickly, but the smart money is on him sticking around on the practice squad.
Cody Wilson (No. 1)
Wilson, the son of the Lions' team chaplain, is a reliable possession receiver who—stop me if you've heard this before—can also contribute on special teams. He has good hands, but he faces an uphill battle to get recognized, as his lack of notable measurables or downfield ability has him stuck competing directly with the bulk of the Lions' receiving corps.
Terrence Austin (No. 16)
Lions fans ought to thank Terrence Austin simply for taking the No. 16 jersey. Whether he makes the roster or not (probably not), at least it helps the Lions start to associate the jersey with someone other than Titus Young. Austin spent a pair of lackluster seasons with the Washington Redskins, then spent the entirety of 2012 as a free agent. Because he already has two years of NFL experience, he is ineligible for the practice squad. In other words, he's a long shot to make it out of camp.
Matt Willis (No. 12)
Another long shot for the roster, Willis may as well not even take any reps at wide receiver. He had 28 receptions for the Denver Broncos in 2011 and 2012 combined, and he stuck around mostly with special teams play. That will be what he has to do this year as well.