If you are correct the apostle Paul is wrong.
1Co 15:24 Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power.
(The end = Someone is giving a kingdom to someone else.)
1Co 15:25 For he must reign, till he hath put all enemies under his feet.
1Co 15:26 The last enemy that shall be destroyed is death.
(Someone is reigning until death is destroyed. People are still dying naturally and spiritual. DEATH HAS NOT BEEN DESTROYED)
1Co 15:27 For he hath put all things under his feet. But when he saith all things are put under him, it is manifest that he is excepted, which did put all things under him.
(Someone put all things under someone except the one doing the putting.)
1Co 15:28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
(
Isaiah 9:6 is finely fulfilled when the above happens)