No need both types are already competing at the same games. Stephen Phinney has stated many times that he cannot disclose some names he trains, I cannot site another trainer off the top of my head who trains Olympic level athletes, I do recall she was on a panel of around 6 in this space answering end of session questions.
I can talk from personal experience as a once elite level Karate man (former British champ). Keto adapted training for strength and endurance is superior in my view. For short explosive bursts such as 60, 100 and 200 metres, carb based performance I feel shades it, due to the immediacy of the glucose (if ultimate tenth of a second performance is required)...having said that Dr Shawn Baker recently won a world event his age group for a glycolytic rowing event, and in contrast Zach Bitter gained 2 world records, 1 was for running 100 miles in the quickest time. For those who don't know Shaw does full carnivore, Zach uses carnivore / high fatstrategically for optimum recovery.
For some reason beyond me, many back to back tests outside of Volek and Phinney compare persons who are carb burners with persons who have transitioned to the diet for the trial, rather than allowing several months for Keto adaption.
