...we have never been gone from your fifth dimension

[Infinite]

I didn't say they couldn't choose another form...I suggested that they had chosen the blue avian one.

I don't know. But, I don't believe these blue avians are Ra. Ra made it clear that their conditions to contact was much restricted. And, the informations of Corey Goode is much transitory, a characteristic that would put away Ra.

I could be wrong. That's why I put it out there...to get other perspectives.

And I respect my brother.

There are also hieroglyphs of blue avians in egypt

That answer of Ra seems indicate that the "bird" thing had nothing to do with them, because the bird form were adorated before Ra arrive :

23.1 Questioner: You were speaking yesterday of the first contact made by the Confederation which occurred during our third major cycle. You stated that you appeared in the skies over Egypt at the same time, approximately, aid was first given to Atlantis. Can you tell me why you went to Egypt and your, shall we say, orientation of attitude and thinking when you first went to Egypt?

Ra: I am Ra. At the time of which you speak there were those who chose to worship the hawk-headed sun god which you know as vibrational sound complex, “Horus.” This vibrational sound complex has taken other vibrational sound complexes, the object of worship being the sun disc represented in some distortion.

We were drawn to spend some time, as you would call it, scanning the peoples for a serious interest amounting to a seeking with which we might help without infringement. We found that at that time the social complex was quite self-contradictory in its so-called religious beliefs and, therefore, there was not an appropriate calling for our vibration. Thus, at that time, which you know of as approximately eighteen thousand [18,000] of your years in your past, we departed without taking action.

I feel like the book of Ezekiel in the bible is an account of an encounter with these beings...but 'in the spirit'.

These answers of Ra seems indicate that Ezekiel's experiences was in physical plane, seeing materialized thought-forms by Yahweh:

24.9 Questioner: Then Yahweh, in an attempt to correct what he saw as what I might call a mistake (I know you don’t want to call it that), started 3,300 years ago with the positive philosophy. Were both the Orion and Yahweh philosophies impressed telepathically, or were there other techniques used?

Ra: I am Ra. There were two other techniques used: one by the entity no longer called Yahweh, who still felt that if it could raise up entities which were superior to the negative forces, that these superior entities could spread the Law of One. Thus this entity, “Yod Heh Shin Vau Heh,” came among your people in form according to incarnate being and mated in the normal reproductive manner of your physical complexes, thus birthing a generation of much larger beings, these beings called “Anak.”

The other method used to greater effect later in the scenario, as you would call it, was the thought-form such as we often use among your peoples to suggest the mysterious or the sublime. You may be familiar with some of these appearances.

24.10 Questioner: Could you state some of those after making the instrument cough, please?

Ra: [Cough.] I am Ra. This is information which you may discover. However, we will briefly point the way by indicating the so-called wheel within a wheel and the cherubim with sleepless eye.

I believe this is the confederation with Ra at the top in the 6th, unified dimension...which is signified by the eagle being 'above them all'...in an encompassing way, I feel.

I believe there is some spiritual meaning in the eagle as you said, but not in the nature of Ra.

Could the blue spheres be thought forms? Wormholes, capable in 5D?

Which blue spheres?