Kit Harington walked away from Eternals with one of the more intriguing teases for a character’s future in the MCU. His Dane Whitman was on the verge of becoming Black Knight, the Ebony Blade had finally entered the picture, and even Blade was involved.Five years later, Marvel still hasn’t done anything with it, and Harington doesn’t sound particularly confident that it ever will.Harington played Dane Whitman in the 2021 Marvel film, which gradu…