Yeah, I misunderstood the line and thought it had something to do with what you said about Wrath living inside the gate.
Someone just pointed me to a wiki page stating: "In the anime, Wrath is the Homunculus reincarnation of Izumi's son, who died at birth. After Izumi tried to resurrect him and saw that what had come back was not her child, Wrath was given to the Gate. Izumi later regretted her decision after hearing him cry and tried to reach him, but the gate closed before she could. Wrath spent much time inside the Gate, waiting and wanting to get out all while his body aged and the hate for the mother who had condemned him to the absolute darkness of the Gate grew. When the Gate opened while the Elric Brothers were trying to resurrect their mother, Wrath acquired both Edward's right arm and left leg."
That basically confirms what you thought lol. I hope they actually show that explanation, though.
I didn't really care for the movie in general, so I'm not the best person to ask. Not only was the animation less polished, but the story itself didn't have the same feel as the series. There were some spectacular moments (train wreck, anyone?), but it just didn't feel the same.
^^ To be honest, I love them both equally, but for different reasons. It makes me sad that you say you will never watch it, because you're truly missing out on something spectacular. IMO, FMA is the better story, because it's tighter, and there is less fluff to it. It also makes you think a lot more than FMA: B. Yeah, it doesn't follow the manga exactly, but is that a bad thing?
The JP BDs only came out a few months ago, I'm sure that Funi is at least interested in releasing the series on BD here since it's one of their top-selling titles. I know I'm thinking about double-dipping if they do.
I would probably side with Homunculos
Ever since I read Frankenstein I've always sympathized with the creations over the creators. The creations did not ask to be brought into the world and generally have to do whatever they can to survive more so than the average human due to Physical appearance (disfigurement, excessive hair, etc) , dietary needs(yep, I was rooting for the Vampires in Shiki) or Mental capacity. Some did what they could to live and survive and maybe try and better themselves unlike some of the so called Good Humans that slaughtered villages(following orders is no excuse), turned their own family in chimera, etc.