Finally we got an clarification on this mystery from theymos.
FYI: The humans handling the new account recoveries system which was implemented late last year are a company that Cyrus created called
Cryptios.
alanst, 3dOOm, and Rizzrack -- the "mysterious newbies" who some people noticed -- are three of their employees. They've been doing a great job.
Mystery is solved, they are the account recovery team members.