I never said unqualified. I used relative terms like less skilled, for example the 5% in your example that wouldn't have been hired without quotas.

The non-quota'd hires in that example, that the additional 5% displaced, are now also more likely to be of higher average skill (since you need less of them and can drop the bottom of the candidates), making a bigger disparity between the quota'd group and the non-quota'd group. Which, as I said, just reinforces any racism/sexism such quotas attempted to offset.

I don't think that actually changes anything. Lets suppose that we can measure qualification on a 100 point scale.

Lets say that there are 5 people in a minority group with a qualification of 100 and 9 people in the non-minority group with a qualification of 100. If 1 person from the minority group gets hired and 13 people from the non-minority group get hired, then a 5 person minority group quota would result in an increase in the qualifications of the people hired.

Of course in reality is more complicated since companies don't always hire only the absolutely most qualified people in a given group and it's not easy to even define objectively who is the most qualified. However, that doesn't matter to the point that I'm making which is that even a quota (which again most proponents of DEI don't want) doesn't necessarily result in hiring less qualified candidates.