Possibly we are not even looking correctly at the concept of pair?

And it doesn't when worms take male & female roles because it is beneficial. I can't see why that wouldn't constitute a pair?

It is not about gender per se as their are hadiths speaking about intersex gender(s): in Hadith (sayings of Prophet Muhammad, SAW), effeminate men are forbidden to enter upon women as they may have interest in women, notwithstanding without natural sexual prowess. Prophet Muhammad (SAW) forbade the entry of an effeminate man in his household, since He (SAW) had heard him relishing the description of physical features of a woman. The narration exhibited amply the effeminate man’s interest in the women (Sahi Bukhari, 1986, p. 119; Mauta ImamMalik, 1979, p.557; Sunnan-e-Ibne Maja, 1983, p. 533).

There are clear rulings in Islam about intersex gender(s) which differ from male and female genders. Their issues has been discussed by early Islamic scholars.

We are looking beyond as to what was being written. The Qur'an is not trying to predict/or state for you a scientific principle/miracle, it is just mentioning a natural occurance for you to ponder over - i.e. how humans/animals seem to be in pairs (male/female).

It was known in ancient times that there were pairs in the human and animal worlds. Later on man learnt of pairs in trees and plants.

In comparison, take the verses of Surah Ar-Rahman:

It states natural phenomena's, as favours that you should ponder over. Is it not taught, that he could have made the rain bitter if he willed?

Take the Qur'an in context, you don't have to see everything in a scientific sense. Their are many metaphoric, or simple literal meanings (as in this case) - which people are looking too much in.

An example would me saying the chair is red - but you argued it somewhat resembles maroon - you are missing the point .

Guess for the time being, we have to leave it at Allah Knows the best.