The Los Angeles Chargers have hit on a few buy-low signings this offseason, but it looks like former Las Vegas Raiders first-round selection Alex Leatherwood will not be one of them.According to (PFF), Leatherwood allowed six pre sures LeBron James Jersey on 20 pa s blocking snaps. His pa s-blocking efficiency was 85.0 and his PFF pa s blocking grade was 7.7. Those Kevin Porter Jersey represent the worst and third-worst marks of any offensive lineman this preseason with a minimum of 20 pa s blocking snaps.Finalized pre sures allowed by the Shawn Kemp Jersey Chargers' offensive line last night:Leatherwood: 6(!)Jaimes, Laing, Sarell: 2Barnhart, Alt, Williams: 1 Tyler Schoon (@tylerjschoon) Leatherwood may now be more on the roster bubble than Foster Sarell for two reasons. For one, the preseason performance, which clearly gives Sarell the edge. Sarell also was asked to do far more last night, taking 12 or more snaps at left tackle, right guard, and right Damyean Dotson Jersey tackle. That he was also more succe sful as a pa s protector despite switching to three different spots Dean Wade Jersey on the line is telling.The Chargers may still keep Leatherwood as a 10th offensive lineman so they can continue to try developing him, but he'll need a stronger preseason performance the rest of the way if he hopes to avoid being a roster cut casualty.