Never heard any of them tell that Cybran has the best destro, everybody told that Aeon had the best destro. Pretending, that people are stupid and dont learn, based on your own inventions is very low and does not add anything to the discussion.
If people pick random faction or faction randomly, then it does not change which faction is more used in statistics. It only makes differences in game numbers smaller.
There can be multiple reasons to pick a faction, as already said, but for my knowledge by far biggest is the faction strenght, glad to see that you now suddenly recognise that the actual strenght of the faction is also considered in lower rated group, when picking a faction. Meaning that it can carry even more in direction of best faction.