Any OLman we ever take in the 1st round. The biggest waste of a pick there can be. Just look through the NFL teams and see where their starting OTs and OGs were taken. You don't need great ones, just decent ones who stay in shape. We need do need help at both OTs, but do it in the mid-rounds with guys like Jeff Allen or the kid from Cal.
Use the 1st round pick on someone who you see as making an instant impact on the team, like we did with last year's pick. That said, this year however I would look at DeCastro because I see him as an impact player and instantly improving our run game. If nothing else, just the fact that 4th and one at the goal line can be 3 or 7 points, depending on the confidence you have in your running game.
DeCastro being the exception, I would be happy with Floyd who instantly helps Fitz and Kolb/Skelly to be more productive. No way he would be a bust, more likely another Boldin.
I have recently gone off of our taking a OLB or DE for I think those available would all be reaches and not worth a 13 pick. But this Fletcher Cox kid is coming on strong on my board. I like him way above the other DTs, for he is a great pass rusher, has a great push in the middle, which we need. He would give us an awesome front line rotation. He isn't a true nose tackle, but I like him anyway and think he can be used in so many ways.
I love Barron, the safety. I feel he will be an instant success.
To me, Barron, Cox, DeCastro, and Floyd would be the 4 sure things to instantly improve our club. I see risk and question marks in everyone else who would be available at 13. Most likely one of these 4 would be there for us.