Ōtsutsuki Toneri was the first trap Shinji had set for Ōtsutsuki Isshiki, and Orochimaru was the second.
With these two baits in place, if Ōtsutsuki Isshiki took any concrete action, Shinji would be sure to notice immediately.
Of course, Shinji couldn't rule out the possibility that Ōtsutsuki Isshiki was so arrogant that he hadn't sought any allies.
So after returning to the Flying Fortress, Shinji put his study of magic on hold and began planning how to strengthen his subordinates.
Shion was studying magic. If she could create a "Magic Ring," there was an excellent chance she would reach "Six Paths level," so he didn't need to worry about her for now.
Karin had already awakened the Rinnegan. At this stage, she should focus on exploring its abilities and, at the very least, uncovering the Space-Time Dojutsu it contained.
That would take time and effort, and there wasn't much Shinji could do to help.
Nameless had not only fused with the Eternal Mangekyo Sharingan but also received a transplant of First Hokage cells. The "Power of All Things" within her was now constantly transforming her body. Once she had accumulated enough Chakra, she could try to awaken the Rinnegan.
Thanks to "Yachihoko," she had an advantage over Karin when it came to accumulating Chakra. And Shinji had plenty of experience and insights to offer on awakening the Rinnegan, so helping Nameless awaken hers was one of his current tasks.
Next was Sasuke.
As the reincarnation of Ōtsutsuki Indra, he was actually more likely to awaken the Rinnegan than Karin or Nameless. So Shinji decided to arrange a First Hokage cell transplant for him as soon as possible.
But first, he had to remove Sasuke's Cursed Seal.
The Cursed Seal Orochimaru had developed contained not only Natural Energy but also Orochimaru's