Why are the stellar outlines defining the shield in Orion's left hand often less distinct than the club side?

The weapon was historically considered the more important identifier, relegating the shield's stellar border to dimmer background stars.

There is an observable difference in the stellar definition between the implements held in Orion's hands. The arm holding the club is strongly defined by the massive luminosity of Betelgeuse. In contrast, the arm holding the shield is marked by Bellatrix but relies on fainter background stars to complete the outline of the shield itself. This suggests that, from a historical perspective rooted in celestial storytelling, the offensive tool (the weapon) was prioritized as a key identifier for the celestial hunter, causing the defensive tool (the shield) to be represented by less luminous stellar patterns.