I'm a little confused how a CO Plat and UA 1K can be equal on a CO flight - since EUA is prioritized by status, then by fare class, it seems to me like UA 1Ks would be prioritized over CO Plats on lower fares or later ticketing dates when flying CO metal.

That means a UA 1K can be ranked higher on the CO pecking order, which is not an appropriate solution or option before the March program integration, especially if a CO Plat is still < a UA 1P on UA metal.