I really just go by fins, color, shape and flowers (whats appealing to me)
If I had to guess I would give him an high B right now. He sure has potential for an A
You will have to wait for the real graders to get on and get the experienced grade.
He is an A grade his kok aka nuchal hump is huge which is a plus his flowerline are full and straight. he has some shinny pearls on him but his tail and his body is kinda long so A- still a high quality fh tho good luck