Your quote: He (Yuzuru) has the best swan arms I've seen. Even better than Baiul because she doesn't have the ballet fingers but he does.
you care about ballet fingers.
I do if we are talking about swan arms. It depends which arms. Vaganova arms are the best arms for swans. Balanchine arms are the best arms for hummingbirds.
Anyway, the problem is not if he is relaxed or not, the problem is his position, I don´t know if to say hunchback is too much, but his body (especially upper back and neck) is inclined the 90% of the time. Modern or classic, that is not a correct posture, even for the daily life, let alone dance or figure skating. If you think his posture is good and innovative, you must to think that Rika Hongo and Elena R. are geniuses.
Or perhaps you have not been exposed to different forms of movement like this, this, this, or this. Such bad hunchbacked dancers they all are.
ETA: Even better, I found a contemporary ballet version of The Dying Swan. She's simlarly hunchbacked.