Assume that Disney never merges with Fox in the late 2010s. They either never sell or are bought by a different company. Whatever the reason is, Marvel is convinced they won’t be getting the film rights to Fox’s half of the MU anytime soon going into phase 4.

Couldn’t they have still technically utilized characters and concepts Fox had the film rights to (e.g. Annihilus, Negative Zone, Shi’ar empire, Silver Surfer, Gladiator, Galactus, Mephisto, etc.) in their animated projects like What If or Eyes of Wakanda?

What characters/concepts do you think they would’ve used? Do you think they would’ve even bothered exploiting this loophole?
Could Marvel Studios Have Used Fox Characters/Concepts in Their Animated Projects if Disney Never Bought Fox?