There are two bytes for each skill player.
Nibble 1 = Sim Rushing Yards Value (Used for Sim kick returns if player is at KR spot, Used for Sim punt returns if player at PR spot)
Nibble 2 = Sim Receiving Catch Chance Value
Nibble 3 = Sim Yards Per Catch Value
Nibble 4 = Sim Target Chance Value
The Sim rushing,sim yards per catch,sim kr and sim pr all pull from the same lookup table.