Kang should've killed Ant-Man in Quantumania. Kang killing an Avenger would have made him a true Thanos level villain for Loki and the Avengers to take on in The Kang Dysnaty and Secret Wars.
Ant-Man and the Wasp: Quantumania neds on one heck of a cliffhanger for Phase 5. We explain the ending, the future of Avengers: Kang Dynasty, Avengers: Serect wars, Loki Season 2, and the Young Avengers.
