>>108991859Doctor Strange is possibly the most interesting character and has a lot of stuff Hickman could play with and do a lot of cool things with but I also think Nova has a lot of untaped potential that writers need to flesh out and Xandar is in much need of worldbuilding that would really be interesting for Hickman to work with.
Like Xandarian culture and how the Empire operated, what exactly is the Nova force, a bunch of unresolved plots from older comics (Queen Adora being corrupted, Garthan Saal coming back in DnA's run and not doing anything so far, the lost Xandarian colony that was mentioned in New Warriors that survived getting destroyed, the fates of the Comet, Powershouse, etc... and the characters we didn't get to see die).
Semi-related but I think Brubaker also wanted to write the character, which is why he included him in his Secret Avengers comic. But Thanos Imperative happened and he lost the character and then he left.