It’s a natural transition for the director, especially if he had some themes or ideas in his head for Guardians that he can now work into The Suicide Squad.
James Gunn’s decision to work on Suicide Squad isn’t a surprising one, considering the franchise is in similar territory to the Guardians of the Galaxy movies.
Both stories are about unlikely heroes with criminal pasts who come together to save the world.
Plus, he’s tried to make peace between Marvel and DC fans in the past, so maybe this is his opportunity to bridge the two worlds in his own way.