I find it very unrealistic for him to know so many about his character but almost nothing about marvel
this give a big plot hole
Even if he understand what a soul stone was from his power
was to fast when he supposed know only iron man or captain america
Ichibe also has Clairvoyance. From the wiki "According to Ĺetsu Nimaiya, IchibÄ has the ability to view events that happen inside the realms outside the Soul King Palace. This clairvoyance even extends to the Valley of Screams.".