These are the potentials:
announcer -> probably one ball
bench warmer -> probably one ball
role player -> probably one ball
I think these are clearly one balls,
6th man -> probably two ball
starter -> probably two ball
star -> probably three ball
allstar -> probably three ball
perennial allstar -> probably four ball
superstar -> probably four ball (this one is certain)
MVP -> probably five ball (this is debatable, but imo, if I'm a developer, I'm putting this here)
hall of famer -> probably five ball
all-time great -> probably five ball
However, Grade rating should also be a factor