Oh God - every time I look at this thread it's like 'Groundhog day' (the movie)!
Questions constantly being asked that have already been answered, sometimes several times.
Clearly, the oil passing through the filter circuit is within the volume contained by shutting off the bypass -that's why when two separate filter bowls have detached themselves the loss of all lubricant has occurred, despite activation of the bypass switch.
The use of the bypass is to isloate the oil cooler from the circuit. That is because leaks from that portion of the circuit are not considered 'extremely remote'. All other leaks - that could result in total oil loss - are considered extremely remote. That much was explained fully by SAC in a recent AOL, and has been pretty well explained on this thread previously. Whether that logic was sound at the point of certification is an issue for the regulator and SAC to revisit, but it is the fact.