the only thing that matters is whether the dossier minus the salacious part, with all the Russian connections and meetings with the Trump campaign, are true....and so far, our intel agencies have come out a couple of times, saying they are proving some of the stuff, as accurate and true....they have verified parts of it.....and have not said anything in there was not true.... just a mix up on the identity of one person, both named Cohen.
Knowing who asked for the opposition information on Trump, falls in to it's a nice thing to know....but not necessary to know....