"Prior to entering Eä" is already a key that does not interfere with any other. It's quite literally the Ainur in their origin.
I suppose? I'm not too sure on how Higher-Dimensional Existence exactly works, but we do consider Eru as 5-D and the Ainur as likely 5-D.
This is from
Splintered Light. It's a fine bit of scholarly work, but it's neither a direct writing from J.R.R Tolkien, or a piece of compiled writing/notes from J.R.R overseen by Christopher or approved editors. It should not be usable, but the idea is interesting. Unfortunately I currently lack time to look into it deeper
Well Eru's mind was never changed, all is as according to his design. They are indeed emanations of the Godhead, but that doesn't matter too much, given that such alone was rejected as supporting proof for them scaling to Eru's dimensionality (other bits of evidence had to be used).
There is little evidence that they remained intwined with Eru's thoughts in that manner after being born from his thoughts. For instance, Nature of Middle-Earth has this from a footnote of the Chapter: "
Knowledge of the Valar"
"
At this time there was no way for the Incarnate direct to Eru, and though the Eldar knew well that the power of the Valar to counsel or assist them was only delegated, it was through them that they sought for enlightenment or aid from Eru."
Although it is noted that.
"
[The Valar] remained in direct contact with Eru, though they, as far as the legends go, usually “addressed” Him through Manwë the Elder King"
But again, that's through Manwë, who is the only one to directly converse to Eru.
Mind you, this is all regarding the Valar (and thus Ainur) following their entry into creation, but even prior to entry (in the
Silmarillion), Eru "
spoke to them..." and when '
they sang before him, and he was glad...". Essentially meaning that the Ainur were separate enough to be appraised and judged by Eru as seperate things. Heck, he even says to Melkor in the AINULINDALË chapter.
"
Melkor, shalt see that no theme may be played that hath not its uttermost source in me, nor can any alter the music in my despite. For he that attempteth this shall prove but mine instrument in the devising of things more wonderful, which he himself hath not imagined."
Essentially affirming the separation of being, even as the Ainur were born from his thoughts.
Wikis alone are poor sources of evidence on their own. It's a good wiki, but it's better to chase up the evidence. Ultra made a good compilation of
links in his prep for the Death Battle video between Sauron and the Lich King.
No worries, it's a bit difficult for me, but it's discernable. Your English is fairly solid.