Seven_Shot
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Tang San has gained tier 10 spirit power long before the ceremony.He just found out why he was at a bottleneck during the ceremony.
The multi shadow clone jutsu is a forbidden jutsu,I don’t think the regular one is.However,I think it was recommended only Jonin use it.
I wouldn’t say it was on equal terms.It was more like haki getting caught off gaurd and not being prepared to deal with the powered up Naruto.Furthermore,the eye awakening analogy can also be applied to the kyubbi chakra.On his own,without these powe ups,he wouldn’t be able to fight her.
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I believe the system is giving a passive growth enhancement and more might be revealed later,so it does bring benefits on top of already fueling the mc’s motivation as It was said that the reason he could continue the grueling training was seeing his stats on the screen.