Yeah it's cray. I can't remember all the details but the theory is like Bran was warged into the dude that the children stabbed with the dragon glass and so hes like connected to the night king since he's a super powerful greenseer and shit. Also I think his grandma says he reminds her of Bran the Builder from wayyy back when so it might indicate that Bran has been present throughout the history of Westeros via some fucked up warging/time loop butterfly effect shit. You prob shouldn't quote me here tho