If you sum the WAR for a teams players, which is determined independently of their record (without factoring in wins and losses at all) it predicts, fairly well, their record for the season. Its not as though they took the teams wins, then divided them up amongst the players. So, going forward, if you *can* use WAR and WAR predictions to correlate to a teams record the next year. I think if you put a teams stats in front of me at the end of the year (excluding pitcher's wins), I could give you a pretty good idea of how that team did without doing a whole lot of calculations. I don't see why this is so amazing. Sure, if I knew each players 2010 WAR before the season started, it might be useful, but I don't. Regardless of the systems that claim to be good at player projections, most of them are really not that accurate from what I can tell, and even if they are, they can't predict injuries, trades, season long slumps (Zito, Andrew Jones, etc), or other in season roster changes. It's about as predictive as the stock market.