Okay, she's managed to explain why they couldn't have just forced alchemists to see the Truth previously, and as I expected, it's because it causes the homunculi that forces them to do so to degenerate. So what, though? If they want to fulfill their Father's wishes, a little degeneration is a smaller sacrifice than waiting around for foolish people to perform human transmutation and risk them becoming powerful enemies. It feels like the explanation has come last-minute when Arakawa realized her mistake in the last chapter.
I think the only one who can force anyone to perform human transmutation is Pride, notably because he needed to absorb Kimblee/an alchemist before being able to do it. So it would have been pretty much impossible for him to force five people to do it, when you see the toll it took on him for only one person.
Second, they weren't waiting for the sacrifices to come along, they were waiting for the eclipse. That's why the human sacrifices became a concern only fifty years ago, and why they put a Homonculus directly in charge of the country. With that in mind, isn't more logical to prepare the grouds for willing sacrifices instead of sacrificing Father's best child?
Third, Arakawa didn't realize any mistake. It was hinted already that what Pride did was not without consequences for him, he was starting to fell apart. And I don't mean "no more regeneration", he literally was falling apart, bits of his flesh disappearing for no reason.
At this point, the fights with the homunculi are getting a little tired. I wasn't thrilled with Edward and Alphonse versus Pride (maybe because they spent ten chapters battling him before) nor Scar vs Wrath (plays out like all other fights with Wrath throughout the story). Maybe things will turn out different now that Scar can uses reconstruction, too, but when the hell did he draw that array on his arm?
More action with Bradley is always welcome, and Scar showed some pretty good moves here, while Greed in the previous fight was pretty much bashing and bashing, never using real martial arts.
Scar probably drawed that array on his arm in the weeks he spent separated from his main party, with only Marcoh as a companion. We know he spent that time seeking for allies among the Ishbalans, but I never understood why Marcoh went with him. Now we know why : they still needed to learn things from the notes of Scar's brother. The left-arm array, as well as the thing the Ishbalan are preparing in the city, are most likely results of those research.
Concerning Hohenheim, I know have the growing suspicion that he will prove useless in the whole thing. Why? Because Father knows him too much, he knows he can be a threat, and might be prepared for something Hohenheim would think of. But he never considered humans a threat, even less so Scar who was so focused on destuction, not creation. That might be his undoing.
