While I might like to think the engine works the way you lay out, I don't think it does. An OF gets to a ball or he doesn't. If he doesn't, he gets a negative play. If he does, glove and arm are now in play. He could make an error or field it cleanly. If he fields it cleanly, it's all arm. And, as I said earlier, arm seems to be key to RF whereas range and glove are the important factors in LF/CF.