Eternal05, I re-read your earlier post and saw you touched on the point I raised. That just means the explanation for pictures 4 and 5 are plain wrong, and even the photos are wrong for what they tried to illustrate. Physically, when you sit tall, you cannot be sideways as much. When you crouch low, you can move sideways a lot more, i.e., hanging off -> more body lean -> lower the combined (body+bike) CG -> less bike lean -> better traction. Another point I want to make is hanging off is not just for speed; it’s also used in low traction situation (water, snow, gravel, etc.) to keep the bike as upright as possible to maximize traction.