I wonder if Shoyo ever got to be the ace of Karasuno :3

I think he did. In the flashback where they're 3rd years :
Yamaguchi wears no 1 shirt, he's the captain. Kageyama wears no 2, he's the vice capt. Tsukki wears no 3, but Hinata isn't no 4, he wears no 5 which recognized as "The Ace's shirt number" in japanese volleyball, just like Bokuto's shirt if you remember he's the captain but he wears no 5 with underline to show he's the capt as well as the ace of the team :))
Hope that helps