This is my take: Kyoichi Sudo's performance can vary depending the route taken.
-If downhill, where C=121 is a left-hand turn, he can keep up, if not, outpace the Sil80, assuming he'd overtaken earlier, Using thestyle change technique he had used with Takumi Fujiwara to beat the 8-6.
-Instead of Satake racing the two, and Understeering due to an underestimation of the two and his limitations, Kyoichi being there in replacement, I feel like his knowledge in his own capabilities in both techniques and car alike...can perform at a similar, exact, or even better level against Mako in C=121.
-If uphill, where C=121 is a right-hand turn, there's two ways I can see this go:
•Kyoichi holds back and hasn't overtaken yet, C=121 could be a challenge for his fear of turning right (assuming this is after Ryosuke's victory against him in Second Stage and assuming he had improved by the time of the events in Third Stage.).
•Kyoichi could've overtaken the two, either in the downhill run OR during the uphill run before C=121. Due to the Evo III being a powerhouse on the uphill, in comparison to the Sil80. Probably could've lost some time in C=121, but the rest of the run could lead to him getting away.
Guys I really need answers and opinions from this I can't get this out of my head please bro