but why when the greybeards and paarthunax knew there was specifically againzt dragons and knowing about it did they not tell your pc at the beginning about it and tried to hide the info? U only found out there was a shout designed for that from the blades and even when confronting the greybeards they at first didnt want to tell you the weapon that brought down alduin? After hearing from the greybeards who didny want to tell you I see paar telling you aout it AFTER the blades let you know there was a shout that did that. So I see paar deally only telling you BC u know theres a shout and mi use trying to act like he dosent know abit..both sidest w axthady on both partys. One dn
Paarthunax doesn't know the Thu'um, and doesn't meet you until later on. The Greybeards are trying to steer you towards the Way of the Voice, which Dragonrend is in conflict with, because you'll take on the hatred behind that shout. To me, the Greybeards telling me about Dragonrend would be akin to a Hindu priest telling me I should convert to Hinduism but eat exclusively at McDonald's. It's something that flies in opposition of the belief system they'd like you to follow, so why would they tell you about it?

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