Reason 3: Fairness - He really wants to give every original EB2I pre Jun 15, 2008 applicant his GC before retrogressing dates. He can't control USCIS's order of processing, and so he realizes many newcomers and post July 2013 porters will get their GCs too at the expense of some of the original EB2I applicants like tackle, so he wants to leave the dates current sufficiently long to get them their GCs.