Some time before he was scheduled to begin working within the program, Rob was replaced by a Union impostor who took his place and attempted to steal a Holon. It is implied that the real Rob was killed.
The following information accompanies Sinclair's profile in the Character Reveal Teaser #4:
NAME: SINCLAIR, ROBERT T
FORMER ASSIGNMENT: VANGUARD FORWARD RECONNAISSANCE
SERVED VANGUARD FORCE RECON UNIT ▮▮▮▮ KENTUCKY, ALABAMA. DECORATED FOR VALOR FOLLOWING ▮▮▮▮▮.
IDENTIFIED GL CANDIDATE ▮▮▮▮▮▮▮▮.
TEMP TRANSFER FROM VG UNIT ▮▮▮▮▮▮▮▮.