1 Corinthians 15:28

And when all things have been subjected unto him, then shall the Son also himself be subjected to him that did subject all things unto him, that God may be all in all.

'Son also himself be subjected to him' -this doesn't mean that the Son is inferior to the Father, or that He isn't Divine. (John 5:23; John 1:1; 1 Peter 2:6; Hebrews 1:3; Hebrews 1:8). Subjection doesn't demand the meaning of inherent inferiority (i.e. wives subject to husbands, slaves to masters, children to parents). Jesus will simply hand over the rule or role that had been assigned to Him. (1 Corinthians 15:24)

'that God may be all in all' -this doesn't mean that everything in the universe will merge into "God".

When every enemy has been destroyed (many that God had merely tolerated in His patience), 'the final rupture in the universe will be healed and God alone (Father, Son, Holy Spirit) will rule over all beings.' (Fee p. 760) All "competition" will be eliminated and in very corner of existence, God uncontested. This also seems to imply, that in very place, God will be acknowledged as God.