[cxS]

You saying it will affect his SEO still is unnecessary and you know it. What's the reasoning behind it, to tell him about what the damage will do? He already knows.

And here we go, showing that your comprehension skills are lacking once again. Did you read?
"I read that too, what I was pointing out is that I see it as being lost without reason. Usually things that do "damage" are done with the hope/insight that it will be better in the long run."

He would lose SEO for a site name, and domain, that both wouldn't give him better SEO than he currently has alone. Regardless of any other factors, these aren't going to be an advantage.

Still makes you look worse since you're trying to dig deep and pull random stuff that has no relevance to this.

Sounds a lot like this last post of yours since it was based on your misunderstanding of what I recently posted.