His prediction is done by Fugil and Yujiro, Musashi can make the batte simulations on her mind (I still think that predicting the match > making battle simulations in your mind, but whatever).
His copying techniques are like Yujiro's and Fugil's, except that Fugil can perfectionate the battle styles and techniques of others like him using Bahamut, Typhon or making Celistia's technique even better than her without seeing the technique.
Blocking attacks far faster than you is something Lux can do, althought, Lux made it for 10 seconds, Fugil should be capable of doing the exact same thing but for several minutes, maybe even more. Aside from Lux and Fugil being capable of fighting againts people 10x faster than them.
His mastery over things, since is every style he has faced, is technically inferior to Fugil's, Yujiro's, and the others mastery, but this isn't from that much importance.
Sasaki is extremely impressive, specially because the small screentime he has, but that's mainly the problem. Fugil, Yujiro, Taskmaster and Musashi all have more feats, some of them arguably better than Sasaki, and they also scale from other people.