Every year it happens, some players are locks to go in a certain area of the draft, and other players draft stock are wildly unpredictable.
Whether it be through limited athletic ability, character issues, or just suspect technique, a number of players will go into free fall on draft day. Some teams might take a chance on them early, willing to accept the boom or bust potential of these picks, but if they don't then the fall can be a long way down the draft.
Brady Quinn and Aaron Rodgers saw themselves fall from potential number one picks to near the end of the first round.
This year is no different, with some players who were top of their class in college maybe not even making it into the first three rounds.
Campbell only started seventeen games as a college tackle, and elected to come out early in his junior year.
He was amazing at the combine, clocking under 4.8 seconds on ome clocks for the 40 yard dash, having the longest arms of any tackle there, and also making 34 reps on the bench press (all the more impressive with the long arms).
But whilst Campbell is a physical phenomenon, scouts have varied widely as to his ability to translate that onto the football field. Many regard him as no better than an average player at present, who will need a lot of time and good coaching to reach anywhere near his potential.
He is the most popular mock draft pick for the Oakland Raiders at number 8, but if he doesn't get picked here he could well slide out of the first round altogether.
Not so very long ago, Ciron Black was being talked about as a high first round prospect, and one of the top offensive tackles in the country.
Now he isn't even being talked about as a tackle, and will probably have to move inside in the pros.
He struggled badly all week at the Senior Bowl, and his lack of short area quickness and poor footwork were exposed again and again as he was consistently beaten by the defensive linemen on the squad.
So how far will he fall?
You would have to believe that a team will take a chance on Black in the mid rounds. He has the size and power to play well at guard, and he has always been a high character player who gave his all.
When a player is giving you 100%, they usually succeed in some form or another, but who will pull the trigger on Black?
It is going to be very interesting to see where Brandon Spikes lands on draft day, and where he is taken.
Spikes has had tremendous production at the highest level as one of the top inside linebackers in the country during his career, but when his 40 time came in at just over 5.0 seconds on his pro day, his draft status went into free fall.
There has never been a linebacker with a 5.0 sec plus 40 time drafted in the first three rounds, and it is unlikely Spikes will be either.
Just over a month ago, he was being projected as a top 15 pick, and battling Rolando McLain on draft boards for the top ILB spot in the draft. Then came his pro day.
What that 40 time means to most teams is that Spikes will be no more than a two down run plugger between the tackles, and would be a hug liability on third down.
My guess is 4th/5th round, a big fall for this player
So what is is about players from Florida this year?
Carlos Dunlap is yet another Florida player with draft question marks hanging over him.
Dunlap is a rare full size defensive end with explosive speed (6' 6", 280lbs, 4.71 40 yd dash), and players like that are rare. He has the potential to be all pro with his physical gifts, and has shown that on the field on a number of occasions.
He could be a truly great pass rusher, but is wildly inconsistent and has maturity and character issues. A DUI arrest dodn't help people's perception of him either.
Perhaps as much boom or bust potential as any player in this year's draft, and could go anywhere between the 1st and 3rd rounds.
Perhaps the ultimate college enigma, and one of the greatest college football players of all time.
But how does he translate to the pros?
Opinions differ widely on this, as Tony Dungy thinks that Tebow is a sure first rounder, but many scouts see him going in the third round or later. Tebow will face similar problems to Vince Young when he entered the league.
Tebow is the ultimate character kid and a locker room leader who is totally committed to football, but will his all consuming desire to succeed be able to overcome his physical flaws as a quarterback?
That is the big question for evaluators to make, not what kind of player Tebow is now, but what can he become?
He could go early, he could go late, but my guess is that some team will take a chance on Tebow. Tebow isnpires belief in people, and thats one trait in a quarterback that you just can't teach.