Instead of GPA give an SPA to your brother to contest the case.

Since your lawyer is better equipped to deal with the situation, you should better follow his advice.

If there is a supreme court ruling, then that is final.

even when there is a supreme court ruling, each ruling is not a precedent, so check from your lawyer if it is a precedent or it comes under doctrine of sub silentio or per incuriam. if it is a precedent it is regarded as law declared by SC and is binding on all the courts otherwise no.