Al Hilal keep in the top perform without Neymar and I believe Malcom, Ruben Neves and Mitrovic will give more effort to help Al Hilal keep on the top position. Al Hilal keep in the unbeaten record in domestic league with playing 11 matches and I think have Neymar or not they can defend good result in domestic league and AFC Champion League.
So even if Al-Hilal releases Neymar in the next transfer window I don't think it will be a problem because Neymar contribution to Al-Hilal is still low, but yeah from the start we knew that one of Al-Hilal main goals in bringing Neymar was popularity so even though his contribution is low, his presence in the team will provide added value or attract the world's attention. One thing that impresses me about Al-Hilal is how long they can hold their unbeaten record, Yassine Bounou was really able to secure the defense well but what if the opponent is Al-Nassr, can he withstand attacks from Al-Nassr players? this is very interesting to wait for and prove who is the best.