Theoretically, name check is not required for i485 approval if i485 pending over 180 days. http://immigrationvoice.org/forum/forum73-fbi-namecheck-delays-and-writ-of-mandamus/17146-name-check-not-required-for-i-485-approval-if-pending-180-days.html
Don't understand why a few 2005/2006 EB2 cases were still not approved. No worry, since your PD is not current yet. Good luck!