Koga Kinsei should take many of the medals in sprint events.
Lafargue, Rudyk and Awang and relevant teammates should ride Look T20/R96.
Glaetzer & Co. on Argon 18 Pro.
Brits either on Cervelo or new Lotus-Hope.
Largest sizes of the above mentioned have pretty long reach and front-center, some 450 and 650mm, respectively.
However, Yuta Wakimoto & Co. performed very well on their short Bridgestones. Even the large size of this brand has reach just under 400mm. Wakimoto won silver 0.036s behind Lavreysen i.e. some 70cm or just a wheel! I would expect him to compete in the sprint in Tokyo.