In addition to muscle fiber type (interesting discussion), angles of pennation for non-fusiform muscles must also be taken into account when determining a riders power/weight ratio.
Athetes with larger angles of pennation generally have larger a cross-sectional area for any given muscle. This allows for greater generation of power, but with a significant weight penalty. In addition to the weight penalty, more oxygen must be consumed by the muscle to generate the additional power. For that reason, it is reasonable to assume that ahtletes with larger angles of pennation would be able to generate greater power, but for a shorter period of time - to addres the 4 minute vs 40 minute theme of this thread.
In any case, for many physiological - mechanical - psychological reasons, different athletes excel at different disciplines, different distances and in different conditions. Some of those reasons are trainable to a much greater extent than others.