I don't know how other people do it, but for me, I compare the player to other NFL players. If Zack Martin were a staring OT in the NFL, he would have the smallest wingspan of any current starting OT and would be on the low end in terms of all NFL OTs in the past 20 years. At Guard the smaller wingspan is not a problem, but it is an indicator of his overall frame and a strong clue that he's not going to play at a significantly higher weight than his college weight. He's not really a power blocker now and doesn't not project to be one in the future. He projects to be a really good zone blocking Guard in the NFL. There is a possibility that he could be more, but the probability is low.