The article says in multiple places that in practice, little of the protein was converted to glucose.

Yes, my understanding is that it will only convert as much as it needs to support the parts of the body that actually require glucose to run.

Ah, ok. I think I figured out where my confusion was at regarding the catabolic pathways from both gluconeogenic and ketogenic amino acids. The correction looks something like [Keto-Acids[Ketone bodies]]

While most catabolic products are categorically and chemically ketones, the list of ketone bodies mostly falls within the list of Keto-Acids. All of which can get passed to TCA at some point, which in turn can feed into gluconeogenesis if the reaction pathway energy is favorable.