3.) Lastly, I think people don't fully grasp the limitations of 1D Se, whether valued or not. Twigs started out as a dancer, a back up dancer at that--any professional dancer worth their salt has 3-4D Se, and usually but not always, valued Se. Excellent coordination, kinesthetic awareness, control over weight and balance in motion, awareness of space, a developed sense of rhythm, a strong ability to learn, mimic and retain movements when being taught, all of which point to high D Se and Si. Is it possible to be a good, professional level dancer with 1D Se? Sure, but I deal in likelihoods, not wild possibilities, and it simply isn't likely.
I know my duals. Lol