Top Rookie Offensively: Carlos Hyde :RB : Carlos Hyde is going to be a great NFL back-up. He is a good player he will be great in their system but if Gore goes down to injury due to being so old Hyde and Lattimore could make a deadly combination. He wont be great this year but about 4 TDS and 300 yards pretty good for a back up running back.
Top Defensive Rookie: Chris Borland : LB: Borland is going to be Zach Thomas talent it wont be immediate. But learning from Navarro Bowman and Patrick WIllis this kid will get his playing time this season and become a solid solid linebacker.
Crucial offensive Player: Vernon Davis: TE: Need I say more??? If Kaepernick could get him the ball he will be the monster he has always been. Vernon is a freakish athlete with so much speed for a TE its impossible for most linebackers in the league without safety help.
Crucial Defensive player: Aldon Smith: OLB: Aldon smith if he can keep his off the field issues under control he will be the best pass rusher in the NFL. He is so absolutely incredible. He brings so much intensity to an OLB spot and the flexibility to move to the end position if needed.