I'd say the ability to assess hit marks comes with experience and seeing and owning many jerseys. I don't think there is a true pattern of where hit marks occur on a jersey because I have seen them all over the place. Hit marks can take the form of scrapes, light facemask residue which may be colored depending on what teams were played in a particular jersey, impact marks which appear just as dings on a jersey, rips/tears, or repairs.