Why was Iwa so average?

Honestly, I'm confused as too as why Iwazumi was much worse than Oikawa. Especially as the ace on one of the best teams in the prefecture, he should have been a lot better IMO. The Oikawa Iwa dynamic could've been a lot better if Oikawa wasn't so much better and they were seen as somewhat equals/rivals

Honestly, I'm confused as too as why Iwazumi was much worse than Oikawa. Especially as the ace on one of the best teams in the prefecture, he should have been a lot better IMO. The Oikawa Iwa dynamic could've been a lot better if Oikawa wasn't so much better and they were seen as somewhat equals/rivals