How so?
The rest of the dead are the ones spiritually dead the unsaved who have died and come back at the throne judgement day
There are two sets of thousand Years one the binding and one the reigning. The binding ends when satan is released and the reigning ends at the end of our world
We don’t reign because satan is bound we reign because of Jesus
When we understand Rev 20 we learn there is only one period of time symbolized a thousand years. This symbolic time begins with the advent of Christ and ends when the seventh trumpet begins to sound that time shall be no longer.
Revelation 20:4 (KJV) And I saw thrones, and they sat upon them, and judgment was given unto them: and
I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received
his mark upon their foreheads, or in their hands; and
they lived and reigned with Christ a thousand years.
John begins by showing how Satan is bound during this symbolic period of time he writes as a thousand years. Then John goes on to write of all who shall be saved and have eternal/everlasting life, who have both lived and reigned with Christ in life, as well as those who shall reign with Christ during this same symbolic time he writes a thousand years.
Rev 20:4 John writes how he is given to understand there is life after physical death for those who die in faith. Speaking of the saints who have been martyred for their faith he writes during this time, symbolized a thousand years they lived and reigned with Christ. The lived and reigned with Christ on earth before they died for their faithfulness. Man must be physically alive to have lived and reigned with Christ in time.
Then John writes of the rest of the dead, that is those who had physically died but were not among the martyred for their faith. John continues to say there shall be other faithful saints who are blessed and holy, have part in the first resurrection and shall also reign with Christ during this symbolic time a thousand years.
Those who have lived and reigned with Christ and those who shall reign with Christ is during the same thousand years when Satan is bound. Then when the thousand years expire Satan is set free for a little season. Rev 10 shows us that when the seventh trumpet begins to sound time, that same time symbolized a thousand years shall be no longer. Because that is the symbolic time the Church is to proclaim the Gospel of the Kingdom of God unto all the nations of the earth through the power of the Holy Spirit. Satan is set free to continue to deceive Gog & Magog after the Kingdom of God is complete when the last Gentile to be saved enters the Kingdom of God. As Gog & Magog under the power and influence continue the spiritual warfare against Christ and Christians still alive on earth during Satan's little season, the saints shall be caught up to meet the Lord in the air, and the fire of God's wrath comes down from heaven to destroy all that is still left alive on the earth.