Bold is a baseless assumption. The Last Naruto is capable of fighting people like Toneri without RSM, and he can throw his Rasen Shuriken, and his Taijutsu and overall CQC abilities look more impressive. That is training. The only time you can argue that Naruto stopped training is AFTER he became Hokage. Not before moron. Everything else has been addressed. The only reason Full Kurama>>Half Kurama is because Full Kurama has more chakra, thus can use bigger Bijuu Dama, and because it's bigger. As explained in my post if you pulled your head out of your ass and read before you decided to come here guns blazing, Naruto doesn't get the size boost because RSM Kurama is the largest Kurama, due to RSM. Getting half of Kurama won't increase it's size. (and it didn't, as Naruto's Avatar is still the same size as Naruto's Avatar pre and Post war)
And more chakra is irrelevant because Naruto's strongest attack uses the power of the Nature Energy on the planet, which dwarfs anything Naruto can do on his own. Not to mention he has half of Hagoromo's power. Larger than Kurama's chakra. The only reason KCM Naruto gets a boost when he uses Kurama's chakra is because Kurama's chakra increases the strength of his chakra. The only reason BM Naruto>KCM Naruto is because BM lets him use the Kurama Avatar and an updated cloak due to being able to access more of Kurama's power. Past that point, more chakra does not equal more power because the strength of the chakra is the same and there are no new abilities to be unlocked. Once again, something I already explained.
And please use fucking periods and type in sentences. Jesus christ. Reading this pile of garbage is honestly hurting my eyes.