I've been thinking about who the face is for some time and the only plausible conclusion I can think of is its an early concept of the Shadow Man.
We know they did this with Dr Monty and his scarf on origins as they didn't have the actors secured so it makes sense to me this is an early concept of the Shadow Man and Jason Blundell has stated in interviews he had the Black Ops 3 storyline wrote down during Black Ops 2.
We know MOTD and BOTD are both orchestrated by the Shadow Man which gives context why he's here.
The Shadow Man also makes an appearance as the BOTD jump scare which I think was Jason Blundell giving us the answer to MOTD jump scare as he would never flat out tell us.
Shadows of Evil, MOTD and Origins all take place in Dimension 63 so the Shadow Man and Dr Monty making early concept appearances makes sense.
The green colour also looks very Apothicon styled too.
That's my theory of the MOTD jump scare but I'm curious if anyone else agrees of if they have any other ideas who this may be.