Ok, so I looked back at that comic. So back in legends of tmrw, Firestorm reverses Black's powers and all the copies in the area disintegrate while a powerless Multiplex is killed when the power plant explodes. Then in Flash, Black said he recently had a near death experience but he then says in the next issue he's not actually sure if he's the original, which is different from in legends of tomorrow when he said each one is a piece of him but hes still aware of the fact that hes the original.
Just a heads up, you don't need to click the dropdown option when you're adding images if you're going in and filling it out later. For some reason, that adds a second blank template and then the site doesn't think those images have been categorized.