Wouldβve been better to ask whether Kouen will be on Ribokuβs level, as we know literally nothing of Gakuki, and likely never will at that. Regardless, for the sake of story Kouen will definitely be one of the top dogs, so depending on matchup he should have the potential to beat anyone.
The 4 Goats, Gakuki, Kouen, SHK and Ouki, thatβs how I see it