why was sasky slacking??

[Gyakusetsu]

As we witnessed Godori = rikudo bijudama >>>>>> naruto's claw

Why didn't sasky godori to kaguya instead of using weak chidori and the failed ps slash multiple times????

I'm betting he can't beat the yet to be revealed main antagonist. That's not where he falls in his threeway deadlock order of main antagonist>Sasuke>Naruto>. Naruto he can beat, but since the main antagonist likely currently resides inside of Sasuke, and since Naruto can overcome the main antagonist their battle will probably stalemate.