Suicide Squad director acknowledges Joker should have been the main villain again - Polygon

We all have that one, nagging regret

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Suicide Squad Director's Joker Regrets

James Gunn Didn't Consider Bringing Back Joker In The Suicide Squad

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Suicide Squad Director Regrets Not Making Joker the Main Villain

Suicide Squad Director Admits One Joker Aspect Went Too Far

Suicide Squad Director Wishes He'd Made Joker the Main Villain - IGN News - IGN