Its just the manga implies they ""defeated"" the admirals.
They are not investigating wether if they defeated Fuji and GB or not.
They are investigating HOW they escaped+ some failed murder plot against one Celestial Dragon.
The plot implies they "narratively defeated" the two admirals + Fujitora was covered on bandages in ch 957, so its easy to assume that at least Fuji got defeated and Ryu neutralised if they managed to escape.
The manga implies the "defeat".