IMO this means that the player is more next to a max. of chances to score if it is direct.... and that is in a good level if it touches the wall, I guess is leveled, so the worst players directly fail, then the 2nd level is when they do a mini shoot that impacts the wall... then here can be a 3rd level that is more for those who assist and when deflect the wall they do an assistance... (so this would be the max. FK level for a assistant...)
and then deflected goals and direct ones. Is like a ratio IMO... and it varies after some weeks, so theres a better player inside the team for these actions.. fk/corners too for PKs... and in this last case I've realized that when a PK specialist have to do it's job tends to fail, so is more like a SA of penalty failer speciality.......

all is internally calibrated, and varies time to time in that case.