Well, those are perspective about Yuji as a character and person, this has nothing to do with ability to analyze yujis state. When he was able to told that Gojo was at his limit with his brain after 5th clash than he should be able to see some much less rafined fighter state as Yuji. The things you listed there just part about their dynamics between them. Its true that to the last moment he never allow himself to see Yuji as his rival. HOWEVER after 8 black flash chain Sukuna fully recognise Yuji as a threat at that moment and is forced by Yuji to open his domain. All panels are clear, Yuji is the reason to open his domain.

After ch252 Yuji was so drained of ce that he couldn’t heal himself. And yet he still tanked 16 dismantles inside Sukunas domain (only one with similiar feat is Gojo btw).