Greetings again Alfred Persson,
I decided to not answer all that has been stated in the various posts, as I consider that what I have already stated is what I still believe and hold fast.
I have been very interested in Isaiah 6 over many years, ever since we had an Isaiah home study class in my early 20's, nearly 60 years ago. The Apostle John identifies the King sitting upon the Temple Throne as Jesus in glory:
John 12:37–41 (KJV): 37 But though he had done so many miracles before them, yet they believed not on him: 38 That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed? 39 Therefore they could not believe, because that Esaias said again, 40 He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them. 41 These things said Esaias, when he saw his glory, and spake of him.
So Isaiah 6 is not a vision of the Trinity, but a vision of the future Jesus sitting on the Temple Throne of David in Jerusalem during the 1000 years. The "us" is not the Trinity, but Jesus including the Seraphim, who were his attendees at the time. The whole vision is rather unique with many layers, but it is not teaching the Trinity.
John 12:37–41 (KJV): 37 But though he had done so many miracles before them, yet they believed not on him: 38 That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed? 39 Therefore they could not believe, because that Esaias said again, 40 He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them. 41 These things said Esaias, when he saw his glory, and spake of him.
That ignores John's reason for saying this: "to whom hath the arm of the LORD been revealed"?
What is the "arm of the LORD". An angel or something more? The question is about believing Jesus' glory, believing "on him" for salvation. Who is the Savior of Israel, is it not Yahweh God?
NKJ Exod. 6:6 "Therefore say to the children of Israel:`I am the LORD; I will bring you out from under the burdens of the Egyptians, I will rescue you from their bondage, and
I will redeem you with an outstretched arm and with great judgments.
NKJ Exod. 15:16 Fear and dread will fall on them;
By the greatness of Your arm They will be as still as a stone, Till Your people pass over, O LORD, Till the people pass over Whom You have purchased.
NKJ Num. 11:23 And the LORD said to Moses,
"Has the LORD'S arm been shortened? Now you shall see whether what I say will happen to you or not."
NKJ Deut. 4:34 "Or did God ever try to go and take for Himself a nation from the midst of another nation, by trials, by signs, by wonders, by war,
by a mighty hand and an outstretched arm, and by great terrors, according to all that the LORD your God did for you in Egypt before your eyes?
NKJ Deut. 5:15 And remember that you were a slave in the land of Egypt, and the LORD your God brought you out from there
by a mighty hand and by an outstretched arm; therefore the LORD your God commanded you to keep the Sabbath day.
NKJ Deut. 7:19 "the great trials which your eyes saw, the signs and the wonders,
the mighty hand and the outstretched arm, by which the LORD your God brought you out. So shall the LORD your God do to all the peoples of whom you are afraid.
NKJ Deut. 11:2 "Know today that I do not speak with your children, who have not known and who have not seen the chastening of the LORD your God, His greatness and
His mighty hand and His outstretched arm--
NKJ Deut. 26:8 `So
the LORD brought us out of Egypt with a mighty hand and with an outstretched arm, with great terror and with signs and wonders.
NKJ 2 Ki. 17:36 "
but the LORD, who brought you up from the land of Egypt with great power and an outstretched arm, Him you shall fear, Him you shall worship, and to Him you shall offer sacrifice.
NKJ Ps. 98:1 <A Psalm.>
Oh, sing to the LORD a new song! For He has done marvelous things; His right hand and His holy arm have gained Him the victory.
NKJ Isa. 30:30 The LORD will cause
His glorious voice to be heard, And show the descent of His arm, With the indignation of His anger And the flame of a devouring fire, With scattering, tempest, and hailstones.
NKJ Isa. 40:10 Behold, the Lord GOD shall come with a strong hand, And
His arm shall rule for Him; Behold, His reward is with Him, And His work before Him.
NKJ Isa. 48:14 "All of you, assemble yourselves, and hear! Who among them has declared these things? The LORD loves him; He shall do His pleasure on Babylon, And
His arm shall be against the Chaldeans.
NKJ Isa. 51:9 Awake, awake, put on strength,
O arm of the LORD! Awake as in the ancient days, In the generations of old.
Are You not the arm that cut Rahab apart, And wounded the serpent?
NKJ Isa. 52:10
The LORD has made bare His holy arm In the eyes of all the nations; And all the ends of the earth shall see The salvation of our God.
NKJ Isa. 53:1 Who has believed our report?
And to whom has the arm of the LORD been revealed?
NKJ Isa. 62:8 The LORD has sworn by His right hand
And by the arm of His strength: "Surely I will no longer give your grain As food for your enemies; And the sons of the foreigner shall not drink your new wine, For which you have labored.
NKJ Ezek. 20:33 "As I live," says the Lord GOD, "surely with a mighty hand,
with an outstretched arm, and with fury poured out, I will rule over you.
NKJ Jn. 12:38 that the word of Isaiah the prophet might be fulfilled, which he spoke:
"Lord, who has believed our report? And to whom has the arm of the LORD been revealed?"
Moreover, do you have examples where God asks Seraphim their opinions and includes them in a "us" "we" "our" situation? If not, then your interpretation is likely "special pleading", denying what is probable for something unlikely.