Look at how Hugh Jan is compared to Lance.
Moire frontal area = more power needed to force yourself through the air.
Jan may be lower but thats because he need to reduce his frontal area more than lance. Power output suffers as a result. Lance position on the bike is oriented more towards power than outright low drag Cd.
Look at Indurain on the bike. He also sat more upright but he was a narrower physique than Ullrich.
The game is power vs drag. Ullrich won because he coul produce power more consistently than Lance. Lance was dehydrated, not enough medium for his bodily chemical reactions to take place and liberate the stored energy. Not enough energy = not enough power. Not enough power = 1min and 36 secs lossi n a TT. Ullrich's position on the bike had nothing to do with his win.