Mikami Yu had indeed considered sealing the Six-Tails inside himself to solve his relative lack of chakra.
Well—compared with Kakashi and the others, he already had plenty of chakra, probably even more than Namikaze Minato.
But compared with the "chakra by the ton" possessed by Uchiha Madara and Hashirama Senju, or even the somewhat lesser reserves of Jiraiya and Tsunade, Mikami Yu seemed decidedly ordinary. He clearly still had a long way to go.
If he had tailed beast-level chakra too, he might be able to use moves like Three-Dragon Annihilation as everyday basic attacks, without ever worrying about running out of mana.
Still, there were plenty of ways to replenish his chakra. It didn't have to be the Six-Tails.
In theory, aside from the Nine-Tails already sealed inside Kushina and the Eight-Tails, whose strong compatibility with Killer B made switching Jinchūriki difficult, all the other tailed beasts were potential targets. In fact, the best option was to collect a portion of chakra from each of the nine tailed beasts and combine them into the Ten-Tails.
Even if that Ten-Tails was a little smaller, its power would still be an entire tier above ordinary tailed beasts.
Mikami Yu figured he could contact Pakura later and start by asking her for some of the One-Tail's chakra.
Judging by the timeline, Bunpuku, Sunagakure's first Jinchūriki, should be nearing death by now. Sunagakure was probably already considering his successor. He wondered whether it would still be Gaara this time.
As for the other tailed beasts—
Since Iwagakure and the Hidden Cloud had already started deploying their tailed beasts on the battlefield, opportunities should present themselves.
At worst, he could pin the blame on Uchiha Madara afterward, claiming that this inherently evil old Uchiha bastard was targeting the various nations' tailed beasts and plotting