Unique to the Restoration understanding of the Plan of God is that we, His children, were there! We were those "morning stars" that sang with joy at the day of Creation, as Job wrote. And we were there when our Savior accepted His Father's will to fulfil His role in the Plan.
About the other guy... Satan, the "old dragon" of Revelations 12, never presented a viable alternative in the Premortal Council. We must be clear in our understanding of that. He was not a valid candidate. He was an unauthorized write-in, of sorts, and what he suggested was not a plan but a mutiny.