Hard to say. Teaching Joe the same mechanics and semantics as those Manning used probably isn't applicable to Joe, as each quarterback has their own learning and playing style. With that said, it seems as though Joe has been involved with more calls at the line of scrimmage this season, but other than this I personally don't see any change.
As far as teaching Joe intangibles, I think Caldwell can only do so much, the rest is up to Joe.