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53. Ogemdi Nwagbuo, DT
If the season started right now, Nwagbuo would (probably) be the Lions' fourth defensive tackle. His current competition in that role is Jimmy Saddler-McQueen and undrafted free agent Michael Brooks. Nwagbuo is the only player in this prediction that I actually don't expect to make the final roster. Look for the Lions to find their fourth DT when roster cuts come down in September.
52. LaAdrian Waddle, OT/G
A big-bodied undrafted free agent, Waddle has a strong chance to make the roster because of his 330-pound size and his experience playing left tackle at Texas Tech. He's probably a guard in the NFL, but that just means he has size and versatility, two things the Lions like. Of course, he'll have to play exceptionally well to earn a roster spot.
51. Carmen Messina, LB
One of the MVPs from the 2012 preseason, Messina should be able to crack the roster because of a general lack of depth at linebacker. He'll make the roster if he can prove his mettle on special teams.
50. Ronnell Lewis, LB/DE
Lewis earned all of one snap on defense last year. Based on the Lions' decision to draft two defensive ends in the first four rounds of the 2013 draft, it's probably safe to say the Lions aren't especially high on Lewis' rate of development. He's a good special teamer, though.
49. Corey Fuller, WR
Matthew Stafford said this about Fuller, according to Tim Twentyman on the Lions' official site: “I haven’t worked with him a whole lot, but he’s got size, he’s got speed and pretty good hands. He’s an exciting prospect.” Exciting, yes, but the learning curve for receivers is steep, and he has plenty of talent to fight through before he's a major part of the offense.
48. Amari Spievey, S
This offseason most likely determines the future of Spievey's career, which is to say whether he has one. He won't be asked to start this year, but if he finally gets his head together (both mentally and physically), he could be a valuable depth player at safety for a team that has needed it badly.