This is a common misconception but bijuu effect on Uzumaki bodies it completely different from anyone else. They inherited a portion of the Gedo's power and as a result only need a portion of the bijuu's chakra to utilize its full power, although that rule only applies to transmigrants.
Naruto didn't need full bijuu for RSM because of his Gedo traits, his BSM also made him EMS Sasuke's equal for that reason, his main power primarily came from Senjutsu because SM is Ashura's main ability.
The other half of Kurama was going to give BM Naruto extra stamina/healing but the change in chakra would have been minimal to an opponent like Sasuke, bijuu chakra is just a bonus like Mokuton.
It's the same if we gave Uchiah the bijuu, the tailed beasts complete the powers of Hagoromo's descendants but they do not dictate the abilities they were born with, Naruto was going to be god tier with or without Kurama because his main ability was Senjutsu control.