Only if you believe the apostles intentional omitted things in their writings. Jesus stated he already taught them all things to be taught. Did the apostle fail in their job? I think not.
You said: Only if you believe the apostles intentional omitted things in their writings.
Of course they did. John said so. He describes a vast amount of information that was not in the Gospels. The epistles certainly do not present volumes of additional things Jesus did that are not contained in the gospels.
Don't we all leave stuff out when we write -- and aren't others grateful? Shall I take pains in this response to include every critical nuance? Would I have time to write it or you to read it?
Then I think another aspect of your argument may be a kind of circularity. Did they KNOW that their writings were going to be put into something called the Bible? Did they each know what the other one was going to write ("Okay Matt, you, Mark and Luke do the last supper, we'll let John do the foot-washing, the farewell discourse and high priestly prayer, and the Bread of Life stuff. Okay? Anything we're leaving out?)
In other words, full blown sola scriptura would require, almost by definition, that nothing was left out. But we can't use it to prove to someone who doesn't believe in it that nothing was left out because the Apostles wouldn't do that.
Is that at all clear? Weren't we talking about the Eucharist here?