but the Pope commands Catholics to exalt their priests with the title "Father", to whom does Meriweather defer?
Two things wrong with this. First, no Pope made any such "command" because early Christians had already adopted the practice. It is one of the many traditions that "came from the Pews" not from the Pope. Secondly, I already explained the many definitions and etymology of what Jesus was teaching/referencing. If anything, I defer to the etymology and actuality of what Jesus was addressing.
Today, it would be call no one father, teacher, boss, mister, missus, or ms. and if we were to remove all these words from our language and replace them with others, the translation would be, "Call no one...by any of the new words. For example, most likely Jesus' own words in Aramaic would have been, Call no man 'Ab'. No one is addressing a priest or pope as "Ab".
In Jesus day, 'Ab' was also being used to designate the founder of a religious sect. Jesus was merely pointing out that God is the founder of faith. Even 'Father Abraham' the human founder of the idea of One God, got his knowledge not from himself, but from God.
Again, even today, 'Father' has over twenty definitions and the same would have been true in Jesus' time. Jesus was not going around teaching children not to call their male parent 'father' or not to address an elderly man with a respectful 'father'.
I think I mentioned before this is a case where you are straining out the gnat and swallowing the camel--when it comes to the definition and etymology of what Jesus was speaking of. And, I did not get my research from the Church, the Pope, etc. I simply researched the history of the time, the word usages of the time, and the etymology of these words.
You can argue all you want that despite my research I misunderstand what Jesus meant, but the one thing you cannot declare is by reaching my own conclusion and understanding, I am "deferring" to the Pope.
In fact, I will suggest that it is more accurate to say that you are "deferring" to the Protestant perception of "Father" and accepting that rather than doing any research.