These reflect my personal rankings of the prospects at each position. In order to incorporate one of the more popular reader requests, I will follow each player with a comparison or two. Some are easy, some are stretches. As I have written before, other than the interview process and medical evaluations, the combine is almost completely pointless for players from BCS programs (particularly the quarterbacks). The hyper-specialized training that costs agents between $10K and $80K in advance money is geared directly for the drills in Indianapolis, many of which do not directly translate to the football field. There are some exceptions though: the 10-yard split time for receivers, running backs, and cornerbacks; the three-cone drill for pass rushers; and the short shuttle for linemen and safeties. Use the times and results in Indy to validate game tape, not override it! Quarterback: 1. Andrew Luck, Stanford -- Peyton Manning with more athleticism, pre-injury Carson Palmer. Could be better than Peyton. 2. Robert Griffin III, Baylor -- Michael Vick with better accuracy and attitude. He is that good. 3. Brandon Weeden, Oklahoma State -- A less mobile Trent Green, or Kyle Orton. Is what he will be already. 4. Ryan Tannehill, Texas A&M -- Best case is Matt Hasselbeck, but not there yet. Has significantly higher potential than Weeden. 5. Brock Osweiler, Arizona State -- Has Drew Bledsoe potential, but could just as easily be Dan McGwire 2.0. No. 5 ranking reflects just how poor the rest of the crop is. 5a. Russell Wilson, Wisconsin -- A shorter, young Mark Brunell. Did I mention he is shorter? Running Backs: 1. Trent Richardson, Alabama -- A faster, bouncier Eddie George. #1 with a bullet. 2. Doug Martin, Boise State -- A shorter Arian Foster crossed with a less-zippy Ray Rice, lower ceiling than both. 3. Lamar Miller, Miami (FL) -- The style of Matt Forte without the vision, a less-speedy Jamaal Charles. 4. Bernard Pierce, Temple -- Chicago-vintage Thomas Jones, an aggressively nifty pounder. 5. Isaiah Pead, Cincinnati -- A cheap version of Jahvid Best without the concussion issues. 5a. David Wilson, Virginia Tech -- Best case is LeSean McCoy, middle road is Donald Brown, worst case is Bernard Scott. Wide Receivers: 1. Justin Blackmon, Oklahoma State -- A slightly faster Anquan Boldin in both skill and mentality. 2. Kendall Wright, Baylor -- Very similar to Mike Wallace, but not quite as tall or top-end fast. Lethal vertical speed. 3. Michael Floyd, Notre Dame -- The physicality of Dwayne Bowe with better quickness, but has some flags. 4. Mohamed Sanu, Rutgers -- Mike Williams the Buccaneer without all the drama, though I think Sanu has a higher ceiling. 5. Chris Givens, Wake Forest -- In the vein of Devery Henderson and Torrey Smith. 5a. Joe Adams, Arkansas -- Shifty, nifty slot guy in the vein of Percy Harvin or DeSean Jackson. Tight End: 1. Dwayne Allen, Clemson -- Reminds me most of an edgier Delanie Walker or a quicker Brent Celek. 2. Orson Charles, Georgia -- A smaller version of Jermichael Finley, drops and all. 3. Ladarius Green, Louisiana-Lafayette -- A skinny, less dynamic Jimmy Graham, crossed with Shawn Nelson. Boom/bust. 4. Colby Fleener, Stanford -- A lither, smoother Jake Ballard. 5. Michael Egnew, Missouri -- Insert oversized, 4.6ish wide out masquerading at tight end here. Tackle: 1. Matt Kalil, USC --Iin the Jordan Gross mold of very dependable, but not dominant left tackles. 2. Mike Adams, Ohio State -- Has a lot of Marcus McNeill to his game, but not as agile. 3. Bobby Massie, Ole Miss -- A throwback pugnacious hoss a la Andrew Whitworth. 4. Mitchell Schwartz, California -- a cheap version of Eric Winston, better RT than LT. 5. Cordy Glenn, Georgia -- At his best, a stiffer Jammal Brown. Probably better at guard. 5a. Riley Reiff, Iowa -- The athletic traits of D-Brickashaw Ferguson, but not as assertive. Guard: 1. David Decastro, Stanford -- Has strong potential to be the next Steve Hutchinson. Really. 2. Amini Silatolu, Northwestern State -- Built like Carl Nicks, but not as refined yet. 3. Kevin Zeitler, Wisconsin -- A movement guard with good feet a la Wade Smith. 4. Brandon Washington, Miami (FL) -- Heavy-handed Davin Joseph, but not as feisty or quite as agile. 5. Kelechi Osemele, Iowa State -- College tackle moved inside because of lack of quickness and agility. Center: 1. Peter Konz, Wisconsin -- A younger Matt Birk, bigger than most of his peers. 2. Ben Jones, Georgia -- Almost invisibly effective in the short area, which makes a tough comparison. 3. Philip Blake, Baylor -- Over-aged try-hard Canadian like former Baylor linemate Danny Watkins. 4. David Molk, Michigan -- A light Dominic Raiola, tough and crafty but vulnerable to power. 5. Quenton Saulsberry, Mississippi State -- Fits best as a reserve G/C for a zone blocking team. Follow Jeff on Twitter: @JeffRisdon