Even if it was like that how does simply awakening the power of a Tattoo or let's say working hard just for an example, able to send Naruto away. Byagoku doesn't surpass RSM's power and to defeat an RSM level user, most likely that powerup was a free giveaway.
When you think about it, you can't work hard for power levels that high, like the Rikudo tier. It was most likely a giveaway because looking at it this powerup is stronger than the Byagoku. It seems more like an asspull created just to take over the Rinnegan/RSM.
Actually, you can work hard for power levels that high. It just seems like you can't because Kishi decided for the most part to make just about everyone a clone of their clan or their village in terms of fighting style (ie. Hyuugas only using gentle fist, Yamanakas only being seen using mind body techniques, the whole of Kumogakure having laser circus, etc...). Because of that tendency of Kishi, it makes it seem like the top tier power levels are unattainable without either being a jinchuuriki, being from an Otsutsuki related clan or having some other special inherent trait. However, this is not actually the case.
Imagine this:
Let's say Kawaki is a lover of quantum mechanics and quantum field theory, so Kawaki is aware that the nuclei of atoms are held together by the strong nuclear force. Kawaki also knows that the strong force is mediated by guage bosons such as w and z particles, and that it can also be mediated by quarks. Now, as an expert in quantum field theory, Kawaki knows that the guage bosons that are exhanged between subatomic particles actually fluctuate into and out of existence via the quantum fluctuation of vaccum energy and the nuclear force fields that permeate the universe. Knowing this, Kawaki decides that it would be a great technique to be able to manipulate these quantum fields, and to be able to stop and restart their fluctuation.
Kawaki then trains to gain sage mode since he knows that sages essentially become one with the natural energy around them. He becomes so good with sage mode that he is able to eventually manipulate the quantum fields (which are in fact apart of nature). So then Kawaki goes to fight RSM Naruto.
Naruto is strong, but Kawaki has an ace in the hole. Kawaki manipulates the quantum fields in the region, and stops the fluctuations of the strong nuclear force field that take place within the nuclei of the atoms in Naruto's body. As a result, all of atoms in Naruto's body just break apart due to no forces keeping the nuclei intact. RSM becomes irrelevant here. No atoms = no Naruto.
R.I.P Naruto (even if he is rikudou level)
Do you see what I mean here? Here in this scenario, no kekkei genkais were used or any other special traits. Just a perfectly trained for sage mode.
It is not always about power level. Sometimes it is about the specific technique or what kind of training you do. This is what I mean when I say you can work for powers that can beat rikudou level shinobi
