In the language of the poker hand, I'm folding on all of these tough trios. Seriously, of the perfumers among these for whom I feel I have some handle on the style, the three cited fragrances are generally very diverse in nature. If anything, they show the breadth of their abilities.
Had Declaration been the third fragrance for Ellena, I might have seen the pattern in his treatment of woody notes. Perhaps some of the lightness and transparency shows through in those three, but Terre d'Hermes isn't as good of an example of that as the other two, IMO.
Tauer's boldness is visible in his first two, but I'm unfamiliar with Une Rose Chypree, so can't comment there.
Duchaufour - the presence of Timbuktu and JXXV in the same list just shows his diversity, IMO. Can't comment on the third.
Very interesting question!