I think I explained already.
A good example is sexual selection. In some animals for example a dominate male may become the only male reproducing and so his genes are the ones that get passed on, but only until that dominate male gets replaced. But in other animals species and even in the case above, other males do "get a little strange" at times and so their genes too remain in the population.
Dominate a population is not synonymous with exclusivity.
And this is important in the example of this thread. Traits that are not seriously advantageous or disadvantageous get passed on. Filtering is only at the extremes.
Anyone so limited that they can only spell a word one way is severely handicapped!