Your "beliefs" seem to differ with these:
“Our Father said, ‘Whom shall I send?’ (Abraham 3:27). Two of our brothers offered to help. Our oldest brother, Jesus Christ, who was then called Jehovah, said, ‘Here am I, send me’….Satan, who was called Lucifer, also came, saying, ‘Behold, here am I, send me, I will be thy son, and I will redeem all mankind, that one soul shall not be lost, and surely I will do it; wherefore give me thine honor’ (Moses 4:1).” (
Gospel Principles, 1997, pp.17-18).
“
After hearing both sons speak, Heavenly Father said, ‘I will send the first.’ (Abraham 3:27).” (
Gospel Principles [2009], 15).
Gospel Principles is an official lds teaching manual. The books of Abraham and Moses are official doctrine. Jesus got picked, Satan didn't. Perhaps your belief is different from official doctrine and teaching?
“
In the grand council called to ratify the Father’s plan, a great difference arose. The majority, led by the First Born of the Father, our Elder Brother, Jesus the Christ, was ready to accept the plan with all its conditions. The minority, led by Lucifer, a ‘son of the morning,’ feared the isolation and the pains and ills of earth. For them Lucifer proposed that they should be sent to earth, but that provisions should be made by which they would suffer no pain and would not have to make any sacrifices. All of them would be returned with earthly bodies irrespective of their works on earth. This latter plan seemed desirable that one-third of those present favored it, in direct opposition of God’s plan. Lucifer and his followers were thrown out of the council, and as opponents of God’s plan, became the devil and his angels, who strive ever to tempt men to disobey the laws of God.” (John A. Widtsoe,
Joseph Smith – Seeker After Truth, pp.156-157)
One could argue that this isn't from a doctrinal source, but that does not stop it from being taught. From the Deseret Books website about the book:
This book was written at the suggestion of George Albert Smith, eighth president of the Church of Jesus Christ of Latter-day Saints. It was finished shortly before his death. He urged its early publication and wide circulation to aid, with other publications, in the establishment of the truth of the claims of the first prophet of this dispensation.
Was your past president wrong? Uh oh...
“On first hearing, the doctrine that Lucifer and our Lord, Jesus Christ, are brothers may seem surprising to some—especially to those unacquainted with latter-day revelations. But both the scriptures and the prophets affirm that
Jesus Christ and Lucifer are indeed offspring of our Heavenly Father and, therefore, spirit brothers.(Isa. 14:12; D&C 76:25–27.) Both Jesus and Lucifer were strong leaders with great knowledge and influence. But as the Firstborn of the Father, Jesus was Lucifer’s older brother. (See Col. 1:15; D&C 93:21.)” (Jess L. Christensen, “I Have a Question,”
Ensign, June 1986, pp.25–26.)
The Ensign is an official lds church-sponsored magazine. How can one be an "offspring" and always existed?