Good question - one I believe will be answered eventually, when ALL the information comes out. The memo is interesting, but it's only a small glimpse into the whole sorry mess. BTW - one thing that seems relevant: The FBI has to review a FISA warrant every 90 days, and, from what talking heads are saying this morning, the Agency cannot use the same documentation each time. In short, they have to show progress in the investigation. If this is true, then the Steele dossier was only used once, and other documentation followed for subsequent reviews.