A man standing in a cubicle with a chair that has a black Ginobili jersey on it.
A big sports fan is working inside his cubicle.
Just because a man is standing on chair that has a Ginobili jersey on it doesn't mean the man must be a big sports fan. Standing in a cubicle doesn't mean the man is working nor does it imply that he is standing in his own cubicle.
Just because a man is wearing a jersey it does not mean he is a big sports fan.
A person can wear a jersey without being a big sports fan.