His appearing removed from reality is not a good type indicator for his situation thus doesn't count. Any S type would look aloof if they had an evil blonde fembot in their head threatening them half the time and seducing them the other half of the time. He was freaked out all the time and had to keep watching his ass, any of us would be more cautious and fearful rather than assertive. And ESTPs are not immune to becoming cowardly. But Gaius does definitely show a strong and most likely, at least to me, dominate Se. Think of how he was back on earth in the pilot episode. I saw him as an ESTP T subtype. Plus I actually see him as being very practical in the sense of an S type, while his blonde ladyfriend guiding him all the time seemed much more N based, which was suppose to be made as an ironic factor in which it also made her seem more human (having faith or whatever) and him more rational.