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Some consider him to be a close disciple—others do not. It is possible that they are disciples of Kundakunda, and I have also mentioned his reference in "Swami Samantabhadra" on pages 158 and 159. In the mentioned history, one should read at least once the writings titled “Umaswati-Samay” and “Kundakunda-Samay.”
5. I have not found any reference before the 10th century Vikram Era, in which Umaswati has written anything about Kundakunda as his disciple.
6. In “Tattvarthasutravartara Ghapirupajikshit,” etc., numerous interpretations of the Tattvartha Sutra are seen at the end, but where they are and how ancient they are cannot yet be said.
7. Regarding Pujyapad and Akalanka Deva, I cannot say anything conclusive yet; however, Vidyananda has referenced Umaswati in connection with the Tattvartha Sutra—his second name is given as Gridhrapichchhacharya in the Black Vartika. There may also be a mention of Umaswati in the Apatpariksha commentary and the like.
Thus, this is your answer to the letters you have sent; they can be sent at this time. Further considerations can be made at another time.
In my opinion, the 9th-10th century Digambara Acharya Vidyananda has made a statement in the Apatpariksha (Shloka 119) that "Varthasutra-Jamajjnanamurimih," and the same is found in the Patravritti of the Tattvarth Shlokavartika (p. 6-50-31).