Tao-sheng Commentary on the Lotus Sutra, p176“After his extinction there appeared a Buddha also called Sun-Moon-Light. After his extinction there appeared another Buddha also called Sun-Moon-Light. In the same manner, seventy thousand Buddhas appeared in succession, all of them being called Sun-Moon-Light with the surname Bharadvaja.”
The purpose underlying the description of twenty thousand buddhas as witnesses for Śākyamuni Buddha is to describe the transformative teaching of the two vehicles, and thus to expound the beauty of the One Vehicle. Thus he must describe a wide variety of Buddhas. Although there are many [of these buddhas,] their path (tao) is in the end one.