The NBA Cup groups should just go by divisions to make them more meaningful.
I know some divisions are more stacked than others but right now the NBA divisions are completely pointless and meaningless. Even when you go to the NBA website and look at the standings, the default view is by Conference.
Right now, the NBA Cup groups are decided based on last season records but if they just go by Division every year, it could intensify the divisional rivalries between teams like in the NFL.
So we would have 3 division in the East and West and the top team from each division moves onto the NBA Cup playoffs and the 4th team is a wildcard team from any division who has the next best record.