Hohenheim Has Been Preparing for Father Longer Than Anyone Else
SPOILER!
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Episodes 36–40
Hohenheim is revealed as the surviving human counterpart to
Father's origin, carrying souls from Xerxes inside himself.
Unlike Father, he has spent centuries recognizing those souls as people and preparing a countermeasure for the day Father repeats Xerxes on a national scale.
Why it matters
The absent father Ed resents turns out to have left his family because the catastrophe that created him was finally approaching them again.
The Five Sacrifices Are Gathered — Including One Against His Will
SPOILER!
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Episodes 58–59
Father needs five people who have opened the Gate. Edward, Alphonse, Izumi and Hohenheim are already part of the plan; Mustang is forced through
human transmutation so the required fifth sacrifice exists on schedule.
What changed
The taboo the heroes chose to break in the past becomes a qualification Father can exploit in the present. Even refusing human transmutation is not enough when Pride and Wrath can force the doorway open.