User blog:Henshin1971/Let's watch Dark Spark War again

After watching, any idea is that A.U(refer to Alternate Universe or Another Universe) Ultraseven or that is original Ultraseven? After watching Shin Ultraman Retsuden Episode 19(actually not watch yet but know from thier official blog), is that original Ultraseven(Ultraman Zero's father) that appear alongside his son, Zero in this episode? If he the original one, then who is that Ultraseven in Ultraman Ginga? Also, is it because after Dark Lugiel defeated, Ultraseven has return back to his homeworld and appear as navigator alongside with his son? I feel confused lol. Just like Kamen Rider Decade story, there are many A.R(refer to Another Rider) World.