User blog comment:D. Cello/Assassinews 01/17 -- ACW New Admin, key Ubisoft figure leaves AC/@comment-25419730-20120208013423/@comment-1888015-20120211153111

Clay (Subject 16) can't be related to Darim, as that would mean Abstergo would have been able to get Altair's memories from him, and then there'd be no reason for them to take Desmond.