Sola Scriptura does not advocate individual interpretation? Whose interpretations were these that you have advocated on this thread all along? They sure were not apostolic. Let me ask a direct question: what to you think 2 Timothy say about the scripture?
The best interpreter of the Bible is the Bible itself, through the Holy Spirit. It is no wonder that you see these as individual interpretations because the Bible interpreting itself so strongly disagrees with Catholic interpretation. In addition, your impersonal view of the Holy Spirit says that He does not lead His children personally in scripture, He only leads a small handful of very powerful men.
And yes, Protestant views can be different. The Spirit reveals only the truth and men appropriate it to varying degrees. Sanctification improves the correctness of the apprehension of the Spirit's revelations. Christians grow in their faiths and are able to accept higher understandings.
I think the passage in 2 Tim. means that all scripture, what is now called the OT and NT, is God's inspired word, down to the last jot and tittle. It is perfect and inerrant. Within only its pages are contained absolutely everything that any Christian could possibly need to know to be exactly the kind of Christian God wishes us to be. Nothing else is necessary for Christians to be completely and utterly equipped and complete.