Sorry, not a good explanation of what I was talking about, and it looks like I changed how I was going to phrase the sentence part way through. Lol
When I used that x-ray type blendable that you are using on that character model to see him through walls a while ago, I had trouble getting the actor to stay on screen. When I partially block him from my camera sight, I can see the portion of him that is blocked by a wall or something, but the second he is entirely blocked, he disappeared.
My guess was that occlusion culling kept him from being rendered and thus had nothing to outline. I tried setting the bounds scale setting, and that worked some of the time but would still culled at certain angles. I had to crank it as high as 13. This was on 4.7 though.
This is the one I am taking about Multi-color Outline Post Process - Tom Looman
It looks like you had it working fine in yours.