I'm surprised by this. I find that if I use predictions for opponents who vary it up, then fighters perform worse than with no predictors (which I assumed meant no attempt to predict, and no impact). My sample size is admittedly small, but that makes more logical sense than assuming it represents 100% to the right. How certain are you that this is how it works?
Is the answer to the original question "you can't"? That seems like an oversight.