I have seen the spool valve seal (the oil filter housing), the oil pan, the oil pump, and the rear main seal all leak independently from one another.
I have also seen many misdiagnosed oil leaks. People think it's the pan when it's really the oil pump and so on. Other than the spool valve, nothing is really easy to "just guess" with. And the oil pump or rear main can be sometimes impossible to pinpoint without taking lots of stuff out of the way.
Acura Master Technician
I will NOT answer requests for radio/navigation unlock codes, so please don't ask.