You could do points/i-shots
I-shot = indirect shot, which means the total of the players shots and the teams shots that would give the player credit
So if in a 10 game season tg scores 13 goals on 24 shots, and had 4 assists off of 15 indirect shots, he would have (13+4)/(24+15)=17/39=##%
It would take his efficiency of his own scoring and his output on the team
This would take forever though |