Vidhi means Brahma, the first created living being. He is the original student as well as professor of the Vedas. He learned it from Sri Krsna and taught Narada first. So Narada is the second acarya in the line of spiritual disciplic succession. He is the representative of Brahma, and therefore he is respected exactly like Brahma, the father of all vidhis (regulations); similarly all other successive disciples in the chain are also equally respected as representatives of the original spiritual master.