So, position by position...
RB: Deep RB class, and a devalued position around the league. With Ellington on the roster, how many carries do we really see him getting? However, you might have a shot at the best player in a good class if you use your #1 pick here. (Todd Gurley)
WR: Deep WR class, and a position that is becoming saturated with young talent. Floyd has not been the player they hoped he would be so far, Fitz is declining, and bottom of the first round WRs are cheap. Should be able to get a good player, but will be tough to see a 2015 impact with Fitz, Floyd, and Brown on roster. (Jaleen Strong, Devante Adams)
OT: Probably looking at a RT which historically is a spot you can fill later. Massie is coming into a contract year so this would be a future pick. I think you take a RT in the first round if you believe Massie has hit his ceiling, and you want more from the position. (TJ Clemmings)
C: The only reason to take a first round C is if you believe the player can be physically a difference maker at point of attack. That is the main ability that differentiates between top C's and average ones. (Cameron Erving)
NT: A position that this team is not putting a priority on. Would be drafted to replace Dan Williams who got paid in free agency. If you are looking for a player, I think you are looking for a guy who can play NT and generate a pass rush on sub packages. (Malcolm Brown)
OLB: A tough position to draft for because it is normally very different from what the prospect did in college. Normally you are looking for a guy to brings high pass rush potential, and probably will have little impact year one. Cards obviously value the ability to physically hold up which makes Owa Odighizuwa and Preston Smith real options.
ILB: A bit of a devalued position, but a player who gets a ton of snaps. Plus athleticism or technique can lead to immediate impact in terms of player time and snaps. Weatherspoon is on a one year deal, and Washington may be back which might make the team look elsewhere.
CB: A premium position with all of the multi WR sets in the NFL. The team is also lacking in depth this year with both Powers and Bethel (I believe) as FAs next year. Nice options could be available in terms of length and man coverage ability. (Marcus Peters/Byron Jones)
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My point is there are arguements in terms of most positions. One thing to consider is that very few players are going to have an immediate impact due to our roster being pretty solid. RB, C, ILB are probably the only spots that a player drafted in the first round would have a shot at starting right away. Maybe NT. The rest will all have specific roles or are being drafted for future considerations which is fine.