I'd have to watch more of him to tell more but the self-pres is apparent in him having a static body position - he doesn't move around a lot, doesn't have wide gesticulations, he's sitting comfortably like a fat toad. Definitely not the Sp/So hypochondriac, contra-flow instead and "beta male" because of his body type and E5 traits. Traits such as: less social flair, less Fe, more cold/theoretical but at the same time "geek" in the sense that he is trying to use his ideas working with the social, in an opportunistic way, has that ENTPish entrepreneurial/brainstormy flexibility.
With the first part I agree, except that she seems to be more focused, more self-confident, an INFJ/IEI. Each enneatype's sexuality may manifest differently. I haven't binged on Tilda vids but from seeing how assertive she was with Colbert so far, I'd say she's more present, more "on the ball." I can see Tilda wanting really intimate connections on the level of emotions... as an So/Sp 4 myself, she really does intimidate me (I feel like if I stared long into her eyes, I'd unravel). Your idea of an Sx 4 with an 8 fix may be more frequent with sensors. If she had a 1, though, that would answer your feeling her "dry" - sx blind 1s are indeed dry, "sterile." All the variants are different configurations, 4s may not immediately jump to being offensive and competitive since they are primarily a self-surrendering type. Her competitiveness and "offensiveness" I see in her persistence at portraying kooky, out of the world, nutty female characters - it's not just her w5 that reinforces that uncompromise/authenticity but the lack of shame (for a Scottish villager, she had to have more than luck to land on scripts that expected that, so perhaps her willpower also played a part).She wouldn't be acting (4ish roles) if she was "double withdrawn," as you describe 4w5 in your blog. As for offensiveness, in Alain de Botton's case I could find his contra-flow only after hours of binging on his vids. They may show it only sparsely on camera. The previous vid I linked allows, for a brief moment, a glimpse into her inner "unruly, nasty child."
No..., you wouldn't.
DD Ne is supposed to be "all over the place" for those who can't follow it's "train of connecting the dots."