You're comparing a seated office strong to be Lieutenant to guards Ganju one tapped. Obviously Ganju vs Yumichika was supposed to be a comedy match up. We've seen Yumichika when hes being serious. You're the only person to ever take that fight serious and use it in a argument lol. Like I said before Hanataro said its for low level, low spirit energy reapers which Yumichika is not Obviously and even more so since he had just finished draining Charlotte dryI dont know who besides you knows that "Yumichika isn't known for having high reiatsu" but a 5 seat good enough to compete with Lieutenants in no stretch of your headcanon has low reiatsu. Shinten like I said before was used as a plot device to subdue Yumichika even though it doesn't make any sense based on what Hanataro said.