So eita's an improved (or for the current story, like) sawamura eijun of DnA.
Correct me if I'm wrong here, but isn't it a catcher's job to also control the game by managing the fielders, the opposing batters and the pitches pitchers do? Yeah hakamada improved a lot in catching but he needs those qualities too. Remembering a quote from DnA (again), he'd be the same as a net without those. And yeah the author skips a lot in storytelling so maybe he is skilled in those as well.