“I received those reports, as did other officials, and there were occasions when I would receive a report in which, uh, a ‘U.S Person’ was referred to. Name, uh, not provided, just ‘U.S. Person’.
And sometimes in that context, in order to understand the importance in the report – and assess it’s significance, it was necessary to find out or request, who that U.S. official was.”
OK, so right there, in the very beginning of the forward narrative, Susan Rice is confirming the “unmasking” request(s) which can be pinned upon her, are directly related to her need to understand -on behalf of President Obama- intelligence for the President’s Daily Briefing (the PDB). This was a previous question now answered.