If Marvel Studios continues its stunt casting trend in Phase 5 of the Marvel Cinematic Universe, these characters could be introduced in upcoming movie post-credits scenes. The tactic of stunt casting throughout the last 15 years, but it became a prominent part of Marvel's plans in Phase 4. Kevin Feige repeatedly used MCU post-credits scenes to introduce new heroes who could play a significant role leading up to Avengers: Secret Wars and during the film's ultimate multiversal fight against Kang the Conqueror. As a result, there is some expectation that Phase 5 will continue the MCU's stunt casting trend.
https://screenrant.com/mcu-phase-5-stunt-casting-characters-predictions/