The only way the 2 explanations could possibly fit with each other is if kaguya did bring an existing ten tails, it grew a decent chakra fruit somehow without an otsutsuki sacrifice, and it morphing back into a ten tails was just an anomaly after kaguya merged with the tree.
Ten Tails: Is It A Ripoff? The Verdict Is In.
The only way the 2 explanations could possibly fit with each other is if kaguya did bring an existing ten tails, it grew a decent...