He may seem emotionally expressive, facial expression wise, in other words, he doesn't have a poker face, but that doesn't leave out 1D Fe to me, especially Fe seeking.
I don't think he is using any F (both Fi and Fe) very efficiently, he seems sound to me, logical. So I don't think he is F type. If you do or someone else thinks so, I am curious why you think that way. Maybe you are seeing something I don't.
I am seeing some Si but I am not sure about its position, just sure that it is strong and not ignoring, so it could be demo, but it could also be creative, I have to watch more videos to be sure.
There are different representatives of types, that's why there is two sub-system and DCHN. I don't expect Ti-doms to have a poker face, they might have it as Fi-doms can also have it. Being responsive towards the emotional environment or having facial expressions dont exceed the limititations of 1D Fe. LxI types are emotive according to Reinin dichotomies.
I think it is more important to focus on how someone process and use info, rather than looking at their level of sociality etc.
Strong Fe is definitely seem different. They directly control the direction of emotional atmosphere. Since it is a dynamic function, you can generally see that person is more aware of the crowd, cameras in those kind of interviews. Lately I have watched interview videos of Matthew Goode, Ewan Mcgregor. When you see that they don't actually use that much expression or use it more wisely, it becomes easier to differentiate strong Fe (and not ignoring) from low Fe.
Kevin Mckidd seems very static, hence I start to think LSI>LSE for him. Probably C or D type in Gulenko's system. He probably has so first as instinctual stacking.