Just of curiosity...
Tell me what is suppose to do Naruto if his so called greatest move- TBB can't even scratch Sasuke's defense?
Any other options left for him or this is it?
Well it obviously isn't invincible considering Hashirama beat Madara and Kurama...who were both encased in PS.....so that combined with chakra reserves would probably do it.
Sasuke's defense=/= Madara's defense. 1 TBB won't obliterate it like some tards like to claim but multiple ones will, but naturally Sasuke isn't going to stand there and watch him charge up those TBBs.