After the battle between Big Mama and Kaido, Luffy, the protagonist of "One Piece", has mastered the domineering spirit of seeing and hearing the future, the overlord color domineering spirit that can be attached to the weapon, and the high-end armed color domineering "Liu Sakura" that can break Kaiduo's defense, and the three kinds of domineering spirit have been enhanced. Coupled with the familiar four gears when playing Xiao Tang, Luffy has been comprehensively strengthened. But the more Luffy strengthened, the more embarrassed his master Reilly became, luffy had been practicing with Reilly for two years, and had not yet gained more than two hours of fighting with Ka Er, Big Mama, and Kaido. Why? Let's analyze it in detail, as follows:

Reilly's help to Luffy doesn't seem much now
What did Luffy gain from Reilly? In fact, nothing was gained. Overlord color domineering, armed color domineering and seeing color domineering are his own inherent, not Reilly gave him, with Luffy being beaten twice by Kaido to know the overlord color entanglement of the understanding, he was beaten twice by Xiao Tang can master the domineering, and there is no need to learn from Reilly. In other words, Reilly didn't actually teach Luffy anything important in two years, and Luffy spent two years going around the New World, and probably gained more than two years of worship.
Luffy's fourth gear is not taught by Reilly, Reilly just let Luffy spawn monsters smoothly develop four gear skills, he does not have rubber fruit ability, can not teach Luffy four gear. The four files used by Luffy when he violently beat Up Xiao Tang, the skills are basically related to the monsters he brushed, such as "Ape King Gun" and "Rhino Howitzer", Reilly is just an NPC who opens a copy, whether he can pick up the skill book in the copy depends on Luffy's understanding. Overall, Luffy's own efforts account for a large proportion of the four gears.
Luffy doesn't foresee and Ryu Sakura, and the pot isn't in Reilly
Of course, Luffy did not learn much more in the new world in two years, the pot is actually not all on Reilly, and many of The One Piece's advanced skills may not be understood by Reilly himself. The ability to predict the future produced by the advanced seeing and hearing color domineering has only appeared on Ka Er and Luffy so far, and Reilly's seeing and hearing color domineering qi has not improved with Ka Er and cannot predict the future. Even if he knew that he could "see the future" when he cultivated to the extreme, he couldn't directly teach Luffy this ability, and the teacher didn't know how to teach it?
Ryu Sakura is Mita's housekeeping skill, and it is also a domineering move that no Kuniku has passed on. Reilly should have seen Mita on Roger's ship, and should have known that Mita would have a special bully. However, the secret of the Kingdom of Peace was not passed on, and Mita did not teach Reilly the cultivation method of Ryu Sakura, so Reilly could not teach Luffy's high-level overlord Qi Qi Sakura. Moreover, Reilly most likely did not know the specific circumstances of the battle between Mita and Kaido, nor did he know that Ryu Sakura had an effect on Kaido, so although he knew that Luffy's opponent was Kaido, he did not mention the existence of Ryu Sakura in front of Luffy.
Overlord color entanglement does not teach, Reilly is the fault of the teacher
Reilly does not teach Luffy to be high-end and armed, and can be explained by lack of ability and no secrets. But if he didn't teach Luffy the Overlord to be domineering, it was really his dereliction of duty. First of all, Reilly and the four emperors such as Big Mama and Kaido have dealt with each other, and the four emperors can wrap the overlord color domineering spirit around the weapon, and the clever Reilly will know it twice. Even if he didn't understand, Captain Roger was also a master of overlord color, could it be that Roger did not tell Reilly about the entanglement of overlord color?
The crew that will not be entangled in the overlord color is basically impossible to harden the four emperors and other masters, Reilly himself is Roger's deputy, in the four emperors civil war to grope and crawl for decades, he does not exist will not be overlord color entanglement, otherwise he would have been cannon fodder. Since Reilly knew that the Overlord was entangled, he couldn't say it without teaching Luffy. Although Luffy had just mastered the domineering spirit and taught the overlord color to be too hasty too early, it should not be mentioned by Reilly.
summary:
Liu Sakura and Seeing Ande knew that Reilly really didn't understand and couldn't do anything, but he didn't teach Luffy the domineering spirit of the Overlord, knowing that the students would fight the Four Emperors, nor did he send the tickets for playing the Four Emperors to the students, and Reilly failed as a teacher. The more skills Luffy learned in the future, the more devalued the two years he spent with Reilly.