im no OL guru but i've read a lot of people saying things like this:
With less than ideal length and lateral range, Martin's NFL future may lie inside at guard, where he never played in college. The move to guard is necessary because Martin does not possess great height, arm length or foot speed. He chucks his way back (rather than sliding) for an effective if not aesthetically-pleasing form of pass protection.
As to size, Martin measured in at the combine at 6-4.5 and 308 lbs. His arms are one inch shorter than 6-7 Taylor Lewan. I looked at his kick slide quite a bit and what I see is a good, fluid athlete with quick feet and reflexes/mirroring. It's all just opinions, and I was very much lukewarm on Martin at first. My basic opinion now, after watching a decent amount of film on him, is that I understand why he's creeping into top 15 projections for the draft. Given our OL needs, his talent and his versatility, if Martin is there at #19 I'm taking him.