If you had 2 players with the exact same ratings, but one was high in every everything and the other was low in everything would the person with all highs perform better in a game? I don't know if anyone has ever thought about this, but I think it would be interesting to know if a player has a chance of performing better in a category if they still have potential.

I've never seen that question before but my guess is that they'd perform the same

They will play to there current rating(same)but obviously the player who has high potential would be the one to play.He will be the better player very soon.

If the player has a higher GPA, with all else being equal, would he perform better? My guess is NO, and that IQ determines that. Thoughts?

GPA has no effect on game play as long as he is eligible.I feel Off+Def IQs are critical.