I apologize for the confusion in my previous response. The information regarding the presiding figure at the Buddhist Council held during the reign of Kanishka at Kashmir is not definitively known. There is no clear historical record or consensus regarding who presided over that specific council.

Kanishka, a prominent Kushan emperor who ruled during the 1st century CE, was known for his patronage of Buddhism and his efforts to promote and support the religion. He convened a Buddhist Council in Kashmir, but historical sources do not provide specific details about the presiding figure.

There have been several significant Buddhist councils throughout history, with the most famous ones being the First Buddhist Council, convened shortly after the passing of Gautama Buddha, and the Fourth Buddhist Council, held during the reign of King Ashoka. However, the specific details of the councils held during Kanishka`s reign, including the presiding figure, remain uncertain.

Therefore, while the names you provided—Parsva, Nagarjuna, Sudraka, and Vasumitra—are historically relevant figures in Buddhism, there is no conclusive evidence to attribute the presidency of the Buddhist Council during Kanishka`s reign to any of them.