In an attempt to get around the LDS apologetic response to the "pronoun argument" from 1 Cor 15:29, some argue that, as οἱ βαπτιζόμενοι ("the being baptised ones") is in the third person plural, Paul is still establishing a dichotomy between himself and those engaged in proxy baptisms. However, this is just as lame as the "they" argument. How so? Note 1 Cor 11:16:
But if anyone is inclined to be argumentative, we do not have such a custom, nor have the churches of God. (NASB)
In this verse, Paul includes both himself and the churches of God as separate entities, notwithstanding their being presented as doing the same thing. In other words, just because Paul uses the third person does not mean he is distinguishing between himself and those spoken of in the third person
In addition, as a friend noted in a facebook group about 1 Cor 15:29:
it is third person plural but not in a way that denotes an “us vs. them” dichotomy. For example, consider the following two very similar sentences in English.
“Why do people go to church?”
“Why do those people go to church?”
One sentence is specific in separation from the speaker, one is ambiguous and can in fact include the speaker as one of the “people”. Both use a third person, but only one specifically uses pronouns to make a comment about a group that the speaker does not consider himself in company with.
The anti-Mormon "counter" to LDS apologists on 1 Cor 15:29 is a failure.
Further Reading
Anti-Mormon Author Admits that Non-LDS Scholars Agree with LDS Interpretation of 1 Corinthians 15:29