this is an interesting question... I am also new to the game... and what I know is that Players' positions update every Season depending on their current skillset/ build by that time... in buzzer-manager we can only see it as "Evaluation"... the tools such as Coach Parrot and Training simulator can provide a possible formula for that... here's the link where you can find them:
http://www.buzzerbeater.com/community/forum/read.aspx?thr...Training simulator has "coef" tab that you can look at... I am just not familiar where to find it on Coach Parrot...