"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." 1 Corinthians 15:28
The Watchower implies that since Jesus is said to be "subject" unto "him that put all things under him" that therefore Jesus is inferior to God, and the Trinity is thus not true. This reasoning assumes that being "subject" implies an inferior nature. However, in many other places persons are "subject" or in "subjection" to another with whom they share an equal nature. Christians which are equally human are to be "subject" one to another:
"Likewise, ye younger, submit yourselves unto the elder. Yea, all of you be subject one to another, and be clothed with humility: for God resisteth the proud, and giveth grace to the humble." 1 Peter 5:5
Wives are to be "subject" to their own hubands, yet this does not mean that a wife has an inferior nature to her husband. They are both equally human.
"Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing. Ephesian 5: 24
"Likewise, ye wives, be in subjection to your own husbands; that, if any obey not the word, they also may without the word be won by the conversation of the wives;" 1 Peter 3:1
"For after this manner in the old time the holy women also, who trusted in God, adorned themselves, being in subjection unto their own husbands:" 1 Peter 3:5
One human being "subject" or "in subjection" to another does not mean that they are inferior by nature to the other, likewise Jesus being subject to the Father does not mean that He has an inferior nature. 1 Corinthians 15:28 refers to Jesus as "the Son." An earthly son is equal to his father by nature, yet can be in subjection to his father without being inferior by nature. Likewise Jesus can be subject to his father, yet equal to his father by nature.