It's interesting how Kagami's ring is very visible here, it really catches the readers eye.
Kuroko's basketball is being the shadow to a light and Kagami's basketball is to create bonds with the people around him.
At this point, we're not supposed to know this about him, but the ring is still physical proof of Kagami's basketball. He started playing to make friends because he was lonely and this ring given to him by Himuro is the embodiment of the first bond he ever made while playing basketball.
Even without telling us more about him, Fujimaki still alluded to Kagami's basketball in the panel where he talks about Kuroko's basketball. And their basketball philosophies align perfectly with each other. Great storytelling, we got there.













