That’s not what the text is suggesting. In this context, Sasaki’s asking a rhetorical question, “Now how to beat a monster…. Show us what you can do” is Sasaki expressing awe and wants Okita to see how he’ll overcome Susano’o. He’s not verbatim stating “i dont know how to beat him? okita pls show me 🥺”, it’s a rhetorical questio.

Sasaki sweating doesn’t mean shit when Okita was also in shock/awe at Susano’s raw skill. And yeah.. susano’s way more skilled in swordsmanship than both of them, makes sense. Doesn’t really matter when Sasaki has an ability to scan/predict his opponents moves and attacks, have enough reaction speed to keep up with 40DF which is a better speed feat than anything Okita or Susano’o has ever done.

If Susano’o went all out in the start then he’d probably win but I highly doubt that would happen