The NFL Scouting Combine is, with the possible exception of pro day for quarterbacks, the most significant period between college football and draft day for the hundreds of players brought in to showcase themselves.
There are many hidden gems available in later rounds, and the combine can bring some of these players to the forefront. DeMarcus Van Dyke's 40-yard dash time in 2011 was likely the only reason he vaulted into the third round, after all.
These 10 players have the athleticism to make a huge splash at the combine. But more importantly, their weaknesses are not something the combine covers, and if there's a time for them to put it all on the line, it's now.
Players with high draft status, such as Barkevious Mingo and Ezekiel Ansah, won't be on the list, as their stock is already high; by default, they can't gain all that much.