Questions about example sentences with, and the definition and usage of "Kamagaya"

A: × Kamagaya is not big city like Tokyo, but unique in its own way.
✓ Kamagaya is not big city like Tokyo, but it is unique in its own way.

× And, there is Kamagaya baseball stadium.
✓ And, it has Kamagaya baseball stadium.

× It’s the ground where that major leaguer Shohei Otani was also practicing.
✓ It’s the area where that major leaguer Shohei Otani practiced.