I disagree, they all were Daedra, some decided to created Nirn, some didn't. These ones became the Aedra, the ones that didn't participate remained Daedra. Not participating in something doen't change you
You're going to have the entirity of this forum disagreeing with you on that.
"Daedra" are thoses spirits who dwell within Oblivion, either within themselves (in the case of the Princes), or within a prince (in the case of lesser Daedra) (much the same as Mortal spirits dwell within the Plane of Nirn, and posibly the other Plane(t)s in Mundus). Those spirits who contributed to nothing stayed locked up in Aetherius and the Void, and are not Daedra or Aedra.
And you're talking about Creation wrong, they Aedra did not change themselves, they gave parts of themselves for creation (which is talked about as the 'true' creation). The Daedra changed themselves, making their spheres within them.