Daf Yomi - Sukkah 27 - Going to the Rebbe on Yom Tov

A question is asked as to why it is not brought down in Shulchan Aruch the halacha of visiting one's Rebbe on a Yom Tov? The Noda Beyahuda answers that this was only in the times of the Beis Hamikdosh when there was a mitzva of aliyah l'regel, however after the destruction of the Beis Hamikdosh, the mitzva of going to your Rebbealso became batel. He explains that the Sages did not want that the honor of the student (Talmid chochom) should be greater than that of the Rav (Shechina).

A question that is asked on the Noda Beyehuda is from our Gemora and other Gemora's where we see that they went to the Reish Gilusa on Yom Tov and Rashi states it was to fulfill the mitzva of going to a Rebbe on Yom Tov. There was no Beis Hamikdosh then and still they went?