Weren't the crests (ususlly heraldic/decorative tops) only part of parade pieces?
Or for the tournament?
Edit:
I mean, explain to me the combat or recognition utility of the crests in the Codex Manesse.
Example Ulrich Von Lichtenstein:
Spoiler Alert, click show to read:
Notice the three rounded prongs on the tip of the lance in the upper-left corner of the illustration, this is a "de-weaponized" lance.