The scouting combine in February is the made-for-TV main event leading up to the NFL Draft, but no pre-draft gathering will have a greater effect on adjusting player grades than this week's practices at the Senior Bowl.

In Mobile, 109 of the nation's elite senior prospects auditioned in front of hundreds of NFL scouts and personnel men. Roughly 30 more turned down the invitation due to injury or personal choice. A year ago, Central Michigan offensive tackle Eric Fisher's dominant play led to his steady ascent toward the No. 1 overall pick by the Kansas City Chiefs. EJ Manuel rode an MVP performance in the game to become the only quarterback to earn a selection in the first round -- No. 16 overall to the Buffalo Bills.

The No. 1 pick this May will almost surely be an underclassman, but don't be fooled -- top prospects at the Senior Bowl have had a lot on the line this week, and my current Big Board reflects it.

The Big Board isn't a mock draft. There is no attention given to team needs or the projected selection order. It is simply a ranking of the 50 best prospects potentially eligible for the 2014 NFL Draft.