even if daas torah IS real (i have yet to see a mokor) if s/o says somthing that is wrong(in anything) then you cant trust them any more unless they prove what they say and they are as good as you or me in there undersstanding ruach haokodesh on the other hand is a case by ccase thing were the tzaddik (not just any talmid chacchom) is not claming to know any thing it could just be that in that case he was not given the knowledge