User blog comment:2013venjix/HOW SUPERMAN, BATMAN, WONDER WOMAN GREEN LANTERN, AQUAMAN & MARTIAN MANHUNTER CAN BE IN THE ARROWVERSE?/@comment-27700324-20160317044120

Dc is very protective with their properties. Deathstroke is gone, because apparently they are going to use him in a movie, same with Deadshot. Marvel is flexible however, and so is Fox, and that is how they arranged their deal.