Pashtus of the Gemara is actually that Moshe Rabbeinu did get an answer, ???? ???? ????? ????? ????. The Gemara then says that Rebbi Meir holds that for ??? ???? ?? there is not always a reason.
Although the Ramban says that Gilgul answers Iyuv’s question of seemingly undeserved Tzaros, that is not the primary function of Toras Hagilgul in the Arizal.