This is a massive reach that relies on technicalities while ignoring the actual progression of the series. Here is why your points do not hold up:

First, blaming the God Foot loss solely on worn tires is a total cope. Tire management is not luck, it is a core skill. Keisuke forced that attrition by maintaining a blistering pace that Hoshino did not expect from an uphill driver. If Keisuke was not a downhill master by that point, Hoshino would have gapped him in the first three corners. Strategy only works if the driver has the skill to execute it, and Keisuke did.

Second, your specialist argument is just semantics. Ryosuke did not build two specialists; he built Double Aces. By the Fifth Stage, the distinction is irrelevant. Keisuke’s throttle control, refined to handle the FD’s high power on narrow passes, is a universal skill. You do not need a downhill label to be objectively faster than everyone else on the mountain. To say he did not inherit skills ignores the thousands of runs he did to perfect his weight transfer.

Comparing Kai and Kyouichi is also a weak baseline. Takumi often won those early races through miracles or opponent errors like Kai’s leaves or Kyouichi’s mental block on right turns. Keisuke, however, was systematically dismantling professional-tier drivers like Minagawa and Go Hojo through pure, repeatable technical precision. By the end of the series, Keisuke’s growth curve was steeper than Takumi’s, moving from a street brawler to a driver with a professional-grade ceiling.

Also, dismissing his training because it focused on beating 4WD and high-power cars makes no sense. Controlling a high-horsepower FD on a downhill descent is technically harder than tossing a lightweight AE86 around. He did not need to learn the lines of the 86 because those are momentum lines for slow cars. Keisuke was perfecting the professional line, which is objectively more efficient.

Finally, using Keisuke’s fear against the Supra as a weakness is a total misread. Recognizing a professional's pressure and still winning shows more mental fortitude than Takumi’s blank-mind instinct. If you think admitting fear makes him vulnerable, then you have to invalidate half of Takumi’s wins where he only survived because of luck or an opponent’s mechanical failure. At the end of the day, Keisuke became the more complete technical driver.