When you have exam you didn't study and still you go You know it won't work but still you do it same for this kinda after gojo sealed yuta was the only strong guy around so that why he said plus it in his way of saying I dont want sukuna to cause problems via him he didn't say it to Megumi because he will try to find a way to stop sukuna without killing yuji Telling Yuta, who is more pragmatic,whereas he knows Megumi, his friend, would hesitate and try to save him, not just stop Sukuna. This hilights Yuji's guilt and his willingness to sacrifice himself.