I guess people fail to realize its stated that tailed beasts are made completely our of chakra and regenerate. Tailed beasts can't die because of this. This is also why when Naruto got a small fraction of each biju, they regenerated to full size. This is further explained when kinkaku and ginkaku are introduced and are able to go v2. So Naruto only got half kurama, bit that doesn't mean he didn't have full powered kurama, which he did.
If he didn't he wouldn't have been able to use kuramas special power which is the avatar.
They didn't get all the chakra to completely make the jubi, but it slowly regenerated and changes into its true form until it hit the god tree.
Glad I could clarify how just because Naruto has full kurama it makes no difference to when he didn't.
Naruto > Sasuke still though.
Wrong. Yes they are living beings of chakra but Minato split Kurama's chakra into Yin and Yang chakra. Kurama's chakra is halved as a result since Yang Kurama can only replenish his yang chakra but it takes both to full use chakra. Yang is physical energy while Yin is spiritual energy as Obito pointed out here to Konan
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. Chakra is made from Physical energy and spiritual energy as Pa toad pointed out
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. The chakra taken from the Bijuus aren't as big as the full Bijuu, just look at the mini 8 tails that was chakra from the tentacle Sasuke gave Obito
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. You can clearly see the Mini 8 tails by the big 8 tails; the mini 8 tails is not going to replenish to the full chakra of the 8 tails; only to the max that was separated from him.
If Naruto was given 10% of chakra from each of the other 8 Bijuus then the Bijuus inside of him would only replenish up to that 10%, not to the 100% that they were created with. That also means the max of the full Bijuus would be less by that 10% so would only replenish 90%. They actually gave Naruto a piece of their consciousness, if it was just chakra like what Kurama makes and give Naruto or what Naruto have the alliance then that wouldn't be the same as what I said and the Bijuus would replenish all of their chakra.