Dear @ernst
it seems to me the relation between Sun and Saturn or Moon and Mercury effects their Avashtas
If we have a good Sun and a bad Saturn it means we know what we are but we don't know what we are not!
So just one of them having a bad avashta will hurt the concept of knowing and living ourselves.
Also when moon has a bad avashta as you say people become NO monsters so it ruins the quality of mercury which wants to check and research things. At list the portion of what Mercury has to test which is related to the stress moon is dealing whit will be blocked. As a result mercury can not do what it was meant to do.
Am I right?
It actually creates both Satisfaction and awe when we see how concretely the parenthood relation between planes is manifested in the Lajjitadi Avashtas/Our Psychology.