The PP Sūtras were supposedly recovered by Nāgārjuna from the Nāgās, but the details of this story are hopelessly confused with the tantric Nāgārjuna, so much so, that Buton winds up claiming that Nāgārjuna debates the hindu Shankara, who lived in the 8th century.
So i see you now refer to Lord Buddha Nagarjuna's revelations as from a Tantric Perspective. And yet in the same breath you talk of hopeless confusion, and drag in more detractors.
tsk tsk tis' a pity .
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edit...there are other conversations in this wandering thread i pointed out , but one can skip and watch the Naga Discussion develop