It is shown in Haikyuu that Sakusa from itachiyama High is one of the top three spikers/aces in the country. But from the knowledge that I have from manga and anime there is no such information.
If I remember, most information about Sakusa is given in the last arc. In Chapter 394 it is shown that he is great at receiving, and it's also shown that his arm is flexible. But compare that to Bokuto who has an amazing cross-shot and is great at line show.
Whereas if we look at Sakusa, even at the national youth camp he was a totally average player.
Am I missing something? Or is there nothing good about Sakusa except his flexible arm and that alone makes him superior to every player in the country?
I know that it is also shown that he works very hard, but so does everyone else, so that doesn't count in his favor.