Hey everyone,
For the most part, this is entirely correct and why you need to be careful which pages you put on which displays (never HSI, SA, etc. on the LDDI).
The only really error is that if there is no active caution or advisory, then the overlay field should be removed. Note though that in order to remove a caution or advisory, the triggering cause must first be addressed, you cannot simply clear the caution or advisory.
Thanks