Well, my own knowledge is spotty, and I have found that philosophy changes gradually, so that immediately before Quine I would expect you to find philosophers who in many ways anticipate a significant fraction of what Quine says. That said, I think that Quine genuinely originated much that was important. For example I think that his essay Two Dogmas of Empiricism contained a genuinely novel argument, and wasn't merely a repeat of something someone had written before.

But let's suppose, for the sake of argument, that Quine was not original at all, but was a student of Spline, and Spline was the actual originator of everything associated with Quine. I think that the essential point that Eliezer probably is the beneficiary of influence and is standing on the shoulders of giants is preserved, and the surrounding points are also preserved, only they are not attached specifically to Quine. I don't think Quine specifically is that important to what lukeprog was saying. He was talking about a certain philosophical tradition which does not go back forever.