its not a definite that u will get a rare at 60, your rare should come within the 40-80 range which is usualy by the 60 point

u obviously dont know how the treasure works at all, there are only 3 normal rares in sage treasure, sasori is a super rare you wont get him with 60 pulls ever. just the fact that you watched 100s of hours of video and dont know that means you didnt pay any attention because i know for certain scion has mentioned that sasori is a super rare.

also you need to be aware that the chinese version of naruto online is not the same as this version, and if you had been watching 100s of hours of youtube videos from scion you would have seen that since they DONT HAVE SAGE TREASURE.

also where in the game does it say 60 pulls will always get you a rare ninja? where have you seen a mod say that? players have tested extensively to find out that the average is 60 pulls, but exact numbers are unknown, I counted out free pulls for my last sage treasure rare, it was 64 pulls to get ao. i didnt do any 10 pulls between getting my orochimaru and ao just free pulls.

you had bad luck, live with it and put another 10 scrolls into the treasure if you want a normal rare(sasori is not a normal rare so there are only 3 of them)