Saffold can't be depended on because of his injury history. He only played in 8 full games this year, 9 last year, & 9 in 2011.
The two offensive lineman we should target are LT Anthony Collins & G Geoff Schwartz. In 592 snaps at LT Collins allowed zero sacks & ZERO QBs hits. He's only 28. In his four years in the league he's only played in more than half the game's snaps 15 times but has never rated negatively in any of them. Geoff Schwartz, also 28, is a versatile offensive lineman that excels in the run game. In 2010 he was +19.2 (+11.3 run) for Carolina starting at RG & RT. In 2011 he suffered a hip impingement & was out for the year forcing him to sign a one year contract with Minnesota as he recoverd. In 2012 for the Vikes he was +5.8 as a reserve. Again signing a one year deal with Kansas City, was a reserve G/RT until week 11 when he took the RG spot from Jon Asamoah. He was +18.3 (+9.0 run) this year. I would envision either one of these guys commanding top dollar on the market & signing both of these guys would free up our first round pick to take the best available player regardless of position. We can grab a starting LG & RT within the first four rounds of the draft & bring back Clabo on a one year deal for insurance at RT.
As for a bigger RB, I would not sign Gerhart. Later in the draft is the way to go with situational RBs & they're cheaper. Hyde, Hill, Williams, West, Wilder, Andrews, & Gaffney are all 220+ lbs & have draftable grades.