Yeah what exactly happened when he went Hachibi against Noob MS Sasuke? Right, he got Amaterasu'd right off the bat
So Itachi was able to use Amaterasu twice, perform a shadow clone, deflect all of Sasuke's shuriken, performed Katon jutsu, sustained Susano'o for quite some time and use Tsukuyomi but would lose all his stamina one minute into the fight against Killer Bee :|
If you believe so, then Susano'o tanks from the start of the fight and Amaterasu ends the fight.
I kinda do but if its not possible for him to contend with Bee's speed, he can use Susano'o(Ribcage) to tank Bee's swords and Amaterasu or Tsukuyomi(unlikely) would be Bee's end.