This shows your unbiblical gnostic view despite your denial. On the cross Jesus didn't yield his "godly spirit" while a separate "human spirit" buried with him in the tomb; He yielded the one and only spirit he was born of (Matt. 1:20) to God (Lk. 23:46). Just because Jesus has a human nature doesn't mean he has a human spirit. Nowhere in 1 Pet. 3:18-22 states or implies that Jesus had a separate soul, human spirit, ghost or "shade", you totally made it up, because in your philosophy you believe in the eternality of the soul, not the resurrection of the body. 1 Pet. 3:18 actually says He was made ALIVE by the spirit, yet you're still searching for the living among the dead.
That is incorrect. Christ subsists in two complete natures, human and divine. God gave His Eternal Son, His only begotten, who was born fully human, with human body soul and spirit. The natures are not confused, God the Son is Spirit separate and distinct from His human nature, body soul spirit.
Definition of Chalcedon
Therefore, following the holy fathers, we all with one accord teach men to acknowledge one and the same Son, our Lord Jesus Christ, at once complete in Godhead and complete in manhood, truly God and truly man, consisting also of a reasonable soul and body; of one substance with the Father as regards His Godhead, and at the same time of one substance with us as regards His manhood; like us in all respects, apart from sin, as regards His Godhead, begotten of the Father before the ages, but yet as regards His manhood, begotten, for us men and for our salvation, of Mary the Virgin, the God-bearer; one and the same Christ, Son, Lord, Only Begotten, recognized in two natures, without confusion, without change, without division, without separation; the distinction of natures being in no way annulled by the union, but rather the characteristics of each nature being preserved and coming together to form one person and subsistence, not as parted or separated into two persons, but one and the same Son and Only-Begotten God the Word, Lord Jesus Christ; even as the prophets from earliest times spoke of Him, and Our Lord Jesus Christ Himself taught us, and the creed of the Fathers has handed down to us.-
Kurian, G. T. (2001). In Nelson’s new Christian dictionary: the authoritative resource on the Christian world. Thomas Nelson Publishers.
Therefore, when Christ said to the thief on the cross "Today, you will be with me in paradise," that is precisely what happened. The human spirit of the thief was "gathered to his people" to Father Abraham and all the saints, who await the resurrection of their bodies, in the "presence of the Lord".
The human soul of Christ went to Sheol, quickened by the Holy Spirit, and in that state preached to the spirits in prison, the hybrid angel human spirits who refused to believe Noah's preaching, that God would forgive their hybrid nature, the corruption of the image of God with the image of angels. These were the men of renown who built the megalithic structures we see today throughout the earth (Genesis 6:2, 4):
18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19 By which also he went and preached unto the spirits in prison;
20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
21 The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ:
22 Who is gone into heaven, and is on the right hand of God; angels and authorities and powers being made subject unto him.
(1 Pet. 3:18-22 KJV)
Christ led these captives into third heaven, paradise to join the thief on the cross and all the saints, when He ascended from hell, taking them "in His train". Taking captivity captive.
8 Wherefore he saith, When he ascended up on high, he led captivity captive, and gave gifts unto men.
9 (Now that he ascended, what is it but that he also descended first into the lower parts of the earth?
10 He that descended is the same also that ascended up far above all heavens, that he might fill all things.) (Eph. 4:8-10 KJV)
The Eternal Son of God, God the Son never ceased to be God in heaven, in Whom all Creation consists (Colossians 1:17), even as His incarnate human nature was here on earth:
And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven. (Jn. 3:13 KJV)
Only the Son of man came down from heaven to reveal God to man, only Jesus God the Son who was still in heaven even as He spoke these words as the Man Jesus on earth.