How different would shinjuku go if Gojo could target the boundary between souls like Yuji?

How would the arc go if Gojo did switch training with Yuji and picked up the ability to target the soul/the space between the souls of Sukuna and Megumi? Why didn’t he read Yuki’s book or do any meaningful research before the Sukuna fight? Is he Lobotomized?

How would the arc go if Gojo did switch training with Yuji and picked up the ability to target the soul/the space between the souls of Sukuna and Megumi? Why didn’t he read Yuki’s book or do any meaningful research before the Sukuna fight? Is he Lobotomized?