It was a fucking ass pull.
Ooooh, Greed doesn't want to take over the world, he just wants to have real friends. I totally did not see that coming!
Bullshit. I hate it when Shonen manga gets preachy. Which they always do.
The plot is so dumb at this point. The writer wrote herself into a corner, and had to use the eternal powers of the Deus Ex Machina to get out.
"He lost control of his God! Now we can attack him!"
Also, the plot twist of Edward getting his arm back makes no fucking sense. Even though Alphonse decided to sacrifice himself, Edward still shouldn't get his arm back. Izuma and Mustang sacrificed their internal organs and eyesight respectively, and all they got was the power to not having to use alchemy seals. Therefore, Edward should still be one arm short, because he can still make alchemy simply by putting his hands together, a technique which requires a sacrifice, one that he no longer has made.