Usui Is the First Time Takumi Cannot Lean on Akina Memory
SPOILER!
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Takumi agrees to race
Impact Blue on a road he does not know.
What changed
For the first time, the viewer can separate Takumi's general adaptability from the enormous advantage built by years of Akina repetition.
C-121 Matters Because Mako and Sayuki Already Know What Comes Next
SPOILER!
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The famous Usui corner is part of a course
Impact Blue has practiced as a pair.
Mako can commit to the car while Sayuki supports the run with information and timing.
Why it matters
Takumi has to learn from their movement while the race is already happening. That is a very different problem from defending his own mountain.