CAP and EVO's Mission is to create new OU Pokemon. If a Pokemon is already in OU, then a project is unnecessary.
Your beliefs and motives in regards to EVO seem to be rather contradictory.
First, I disagree with the notion that CAP and EVO should both be about creating new OU pokemon (only CAP should do that, and EVO should be about "fixing" them), but it seems like we've already decided to move in that direction.
But, then you make mention about a pokemon "already" being in OU. The logic that has been pushing EVO forward so far has been that of turning it into a CAP with the pre-evo being more superfluous to the role it will have in the metagame. Your version of EVO does not depend on the pre-evo, as you wanted to argue that a concept could be applied to a variety of potential evolution candidates. Thus, from this logical perspective, it becomes almost arbitrary which pokemon is chosen to be evolved. "As long as the concept is sound" the pokemon should turn out fine regardless, was the logic. (If the pokemon had an impact on the concept, then perhaps it should have been chosen first...)
That's why your reasoning is so contradictory. You can believe EVO should be about creating "new" pokemon (even though I would disagree). However, if you do, then the pre-evo shouldn't matter, as one could shoehorn a concept to act as any of a variety of pokemon's evolution.
Then we can't use the EVO, simple as that.
This is some of the most ridiculous, convoluted logic I have ever seen.
If an evolution is completely viable and balanced in a metagame, and then its pre-evo also gets bumped to OU, then... for whatever arbitrary reason, the evo is rendered unusable? Are you acting under some sort of belief that because a pre-evo bumped to a higher tier, that it instantly bumps its evolutions by a similar amount?
I'm sorry, Deck Knight, but this is really incredibly ridiculous.
Edit: Also, what tennisace said.