At the moment that Green reaches the zone, Red is clear astern. Therefore rule 18.2(b,c) applies and Red must thereafter give mark-room. (Until the boats have passed the mark.) If Red holds this course, she will not give mark-room.
Remark: When Blue reaches the zone she is overlapped with Red and rule 18.2(b) applies. Therefore Blue shall give Red and Green, the inside boats mark-room.