Sadly I don't think Kato is able to grow because of how limited her court time is which is baffling. Sakai must be aware of what she's capable of. Did she get to play a lot during Summer League?
Kato gets to play in all the third rail tournaments like Summer League , National Sports Festival, etc although I believe last year's V Cup was mostly out of reach
Funny, I pegged Kato as equivalent/better than Arisa Inoue. Basically has a good attack when it's a good set, and nothing else to her game. Inoue is a year or two ahead of Kato but I don't think she's any better.