In Boruto it seems Naruto has access to the other Bijuu elements KKG, so it seems Naruto has access to those Bijuu powers. Thinking it now I should have made it in the Boruto section. Naruto only needed 1 Kurama to survive, but he chose to get both. I have to admit that is a good point about Itachi eyes counting as two.Again, that's nitpicking if we are counting all the bijuus.. At best the Yin and Yang Kuramas but that is still a bit, nitpicky.. I mean they are the same entity. Might as well count Itachi's eyes as 2 different powerups (since each eye does a different tech).
Also Sasuke did gain all of the bijuus as well (after Kaguya) so we might as well give him all the bijuus since we are making them count towards Naruto (unless you're still talking about the seal stages then again, same entity argument). As well as the nature of Naruto having all bijuu is untrue at all. He is not the jin of all of them. They simply meet with him in that Hagoromo space dimension (which is like asking whether or not to help him rather than actually using them as a part of him like Kurama). This is the main reason why he doesn't get to use their chakra unless he goes RSM. Still, whichever way you do it, either count the beasts for BOTH Sasuke and Naruto or only count Kurama.
As for Hashirama cells, IDK why he doesn't gain mokuton. He SHOULD have but I am guessing they did not want him to have it so he only gets a chakra and regen boost or whatever the Hashirama cells do. (I'm not sure but didn't Kabuto give him his dragon sage chakra too?)
Either way, he still has his Curse Mark as we got to see it in his showdown with Juubito when he covered Kurama with it (IDK why they dropped it). I might have missed or forgotten so just LMK.
Sasuke temporarily gained all the Bijuu on to his Susano, which he no longer has access to. He can't turn into that Susano at will, while Naruto has access to the Bijuu KKG element.
Sasuke didn't have his curse mark against Juubito, that was Juugo giving his senjutsu chakra to Sasuke Susano.
As for Kabuto nothing was stated that he gained anything from Kabuto or Hashirama.