Although unable to act directly, finding a strong and powerful ally to intervene is certainly better than watching this situation continue to develop.
This makes the current situation clear.
"He most likely came into contact with the underground forces of the world of sorcery, or even the industry of the Curse Masters, and that's why he suddenly disappeared."
"And the ally he found, without a doubt, is Eric Mozart."
"Because of accepting Reiger Brillhaut's commission, Eric Mozart voluntarily entered the Xiantai Barrier to participate in the Destruction Revisit, using the rules to force me out."
"His goal is to retrieve the Prison Gate Border from my hands and rescue Fushiguro Megumi."
This is Knot's guess.
And this guess is quite similar to Sukuna's intuition.
He also felt that Eric Mozart was brought by that person; otherwise, he wouldn't care about Itadori Yuji and Fushiguro Megumi, nor would he deliberately target Knot.
However...
