Surely we have more than the right to do so after kill harkon and in possession of auriel bow? yet everyone in that castle still treat me as if a newbie

I thought you became the lord of the Volkihar after killing Harkon?

Hmm.

Well technically we become the new lord, but the game design gets in the way. Like with every guild.

but unlike the guilds, those vampire dont even respect you, also the castle seems way too grusome for a vampire castle, those bones make me think of canabals rather than vampires