I've read almost all of this thread, and it's all NONSENSE. "paper, siccsors", "prediction", that this is not "real basketball", etc, etc. And all this to complain about GDP and the ultra super powers GDP seems to give a team.
I think on-the-mark calculation about the plus-Xs GDP gives you takes more than a couple of weeks. In my league, and leagues around my country I've explored, you have the full arc of examples: people who had the right GDP prediction and lost by little, by a lot, or won by a little or by a lot. Like someone here said previously, things like game shape, enthusiasm and stamina play A LOT BIGGER a rol than GDP. If you read some forums around, or get in touch with Josef Ka's work about BB, or if you're just a good observer, you could identify that a game shape of 5 gives you something like a 0.45 multiplier to your player's skills, compared to a game shape of 9. That alone can make your typical starter go from a rating of 12, 13 for 30+ mins in a game to a rating of 9 or even 8. If you spot an opponent with a starter in this game shape hole and you design your offensive to target this player, you bet you will have a good game, regardless of GDP. You see: if you predict GDP right, but your squad doesn't have the game shape, enthusiasm and stamina to work the plan or the prediction, it doesn't matter if you were correct. So there's that.
Second: to this manager complaining about GDP because it forces him to be versatile, you know what's realistic: to adapt to changes made. That's very realistic. I will give you one "real" example: in the 2003-2004 NBA season the Commishioner introduced the no-hand- check rule. And what players did? All players, good players, bad players, borderline 12th-man players, they all adapted and went along. Obviously, the players that made a living for being "good" defenders abusing the hand check [and here you could put many other examples, like palming the ball -guys like Iverson or Damon Stoudamire-, jumping into a straight-elevated defender to get a foul call while shooting, clear-path fouls when there wasn't clear-path rule, etc] all the time, those guys were not very happy. But you adapt, man. You can read the recent Kobe Bryant interview when he says he "hates finesse NBA of today", yes, of course. And we all know that MJ in his prime could average 40, 50 points in today's NBA, where someone whispers at you and that's a foul.
All this to say: YOU ADAPT. Or you go to NBDL. Train some dudes, make them all around. Your pivot doesn't have jump shot? Train it to him. He's to old? Get a young guy with pivot skills and train him in jump shot. You can't play fast because of stamina? Get stamina training. Etc, etc.
To just sit here and complain that the designers of this game are not pleasing your appetite is the least intelligent thing to do. We all have appetites. But when we play this game, we agree to adapt our appetites to the game, and not just the other way around. Otherwise, we just stop playing. The BBs and the developing dudes, of course, will try to please most of the community, but they also have a concept of the game. A concept of the experience of the game. I wouldn't be surprised if a glicht or two are unpopular.
So relax, man. If you like this game, read some forums, chat with some managers, ask for advice, scout your opponents, get the training going. That, instead of whining about GDP, will get your team going.
And if you still insist with all this "prediction" cry, well, what can I say? Try Monopoly. They have dice!