I think I was able to find out what the Prerotate setting does.
I know in Sam's video about help defensive settings, he says you should put it on the opposing center who you want to rotate off of but I don't think that this is what it does. I think you are having success with these settings because of the Help defense setting being set to Auto for the opposing big. (No offense Sam, I'm a big fan
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I've done some testing and what I think it does is causes an extra defender to come help when the opponent player with Prerotate set to Yes is isolated on one side of the floor.
I posted this in the other thread about Help defense being broken, but I think this is a more appropriate thread for it:
You guys test this out and let me know if you are seeing the same thing.
Let's hope we're still getting that ScottOG stream sometime this week!