Originally Posted by rpenmanparker

That is completely wrong. It doesn't matter whether the seat post is inside a longer seat tube or exposed above a shorter seat tube. The line is the same. The effect you are talking about only relates to seat tube angle, not the length of the seat tube. With the same seat tube angle and reach from the BB to the saddle, it doesn't matter how long the seat tube is or how much post is exposed, only the total of the two. It has no effect on saddle position. Think about it!