You are quoting Rev. 20: 6 regarding those who overcame the A/C and who were beheaded. (Rev. 20: 4) They certainly are resurrected as they died.
How can believers who are alive when Jesus comes for His Body, miss out on `resurrection to life.` Jesus is eternal life and that is what we have, and just need our physical bodies to be resurrected from this earthly body to a spiritual body. (1Cor. 15: 44)
Why would those who already possess eternal/everlasting life through the Spirit of Christ within them need a physical body to have life?
If we believe the life we receive in Christ by grace through faith is indeed forever (and it is), we continue to be alive when our body has died. We don't need to be resurrected to be alive, we ARE alive through Christ. These disembodied (headless) saints John saw were not physically resurrected, because death of the body could not kill them. (Mt. 10:28) After physical death they continued to be living souls in heaven the spiritual body of Christ there. Because when the body of believers dies, our spirit (alive/living soul) returns to God.
1 Corinthians 15:44-46 (KJV) It is
sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body. And so it is written, The first man Adam was made a living soul; the last Adam
was made a quickening spirit. Howbeit
that was not first which is spiritual, but that which is natural; and afterward that which is spiritual.
Ecclesiastes 12:7 (KJV) Then
shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.
We know the resurrection of the physical body for ALL who have died and buried shall be resurrected to life again in an hour coming, when the last trumpet sounds and time given this earth shall be no longer. That resurrection coming will be resurrection to immortal & incorruptible physical life or resurrected to damnation.
John 5:28-29 (KJV) Marvel not at this: for
the hour is coming, in the which all that are in the graves shall hear his voice, And shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto the resurrection of damnation.
1 Corinthians 15:48-53 (KJV) As
is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly. And as we have borne the image of the earthy, we shall also bear the image of the heavenly. Now this I say, brethren, that
flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption. Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed, In a moment, in the twinkling of an eye,
at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal must put on immortality.
Revelation 10:5-7 (KJV) And the angel which I saw stand upon the sea and upon the earth lifted up his hand to heaven, And sware by him that liveth for ever and ever, who created heaven, and the things that therein are, and the earth, and the things that therein are, and the sea, and the things which are therein, that
there should be time no longer: But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.