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Time-Decision.
123
Your assumption does not seem reasonable at all. What guarantee is there in the mere mention of the fact that Samantabhadra was not much earlier than Kumaril but only a short time before him! Special evidence was needed to prove this, which is lacking in the said book.
In the case of Dharmakirti, Vidyabhusanji has stated the clear time of Dharmakirti (possibly the time of Dharmakirti's establishment in the Acharya position) as around 635 to 650 AD and has mentioned three things in support of this time - one is that Dharmakirti's guru Dharmapal was alive in 635 AD, his existence is known till this year, so Dharmakirti should also be present around that time; secondly, Dharmakirti was a contemporary of the Tibetan king 'Sron-Sgampo', whose existence is found from 627 to 698 AD, and Dharmakirti's time coincides with this time; thirdly, the Chinese traveler 'I-tsing' traveled to India between 671 and 695 AD; he (in his travelogue) clearly states how 'Dharmakirti made further progress in logic after 'Dignaga'. Apart from this, after Dharmakirti's Buddhist initiation, Vidyabhusanji has also revealed that Dharmakirti performed Tirtha
1 In the same year 635; when the Chinese traveler Xuanzang reached the Nalanda University, his disciple, Silabhadra, had been established in the main position in place of the said Dharmapal; this is found from Vidyabhusanji's said book.