I didn't say any such thing. I was simply stating that in a state like Texas, which is the 2nd biggest in the nation and has a large military presence, the pool of senatorial candidates is far greater than a particular district. Assuming the nom boards make decisions based off merit, and assuming that the candidates aren't all from a single district, Cornyn's and Hutchison's 10 candidates will be far more qualified than the top 10 in a single district.
So, hypothetically, the "least qualified" candidate on Cornyn's slate could perhaps be the "most qualified" in his district. But because he can't get his MoC's nomination, and in turn isn't charged to his MoC's vacancy, he goes into the national pool. Going back to the OP's question, a senator nomination is the same as a house rep's nomination when in the national pool.
There's flaws in this logic, of course, but it is generally true. I only replied to this post because it's exactly what happened to me last year.