In the introduction of Deadshot in the Suicide Squad movie, he is referred to as the greatest assassin. But references in the comics and video game, "Arkham Origins" consider Slade Wilson, aka, Deathstroke as the greatest assassin in the DC universe, especially considering he has beyond-human capabilities. Considering Deathstroke has a place in many stories related to the heroes of the Justice League, including Batman, is this poor writing simply? Or does Deathstroke not exist in this universe at all?
In the introduction Deadshot was not referred as Greatest Assassin.
But referred as: Assassin for hire/ Human Arsenal
Most wanted Hitman
Man who never misses
And we do have Deathstroke in DCEU
First Ben Affleck shares cryptic footage of Batman villain Deathstroke
And then it was confirmed that Joe Manganiello is Deathstroke in Ben Affleck’s Batman Film.