IMO I don't think it is possible to compare holding your own against Ultron and his army along with the rest of the Avengers vs having an assist from Falcon to beat Red Skull after getting manhandled by skull. Hard for me to see how Red Zone is a evolution of BP. In which way is the Red Zone story line a greater showing for T'Challa?
Side Note: Ultron Unlimited really impacted the BP mythos. It was after this story that Priest gave T'Challa the anti-metal claws and the introduction of the Wakanda Design group.