For what it is worth, I do not think that Chaos does not need
heroquests or even worship. Ragnaglar and Wakboth do not even exist in
Glorantha any more, Thed is a broken shell, and Mallia is Mallia.
Worshipping Ragnaglar and Wakboth is magically pointless (except
perhaps as a way of weakening the world). The broo worship Thed
because she is their ancestor and many people offer sacrifices to
Mallia to keep her away.
Jeff