Secondary failure - looking at the pics. The check valve is LITERALLY right in front of the bypass valve. Get that oil up to operating temp, and that rubber is nice & pliable, meaning those little "feet" on the back of the check valve would not have much rigidity to prevent the CV from blanketing the PRV holes. Partially or fully-blocked PRV could result in spike in pressure delta across the filter which could result in a "collapse" event.
I'm in with Zee, your theory is fake news. The feet plus the design of the ADBV prevent this. Remember that once the engine is running, both sides of the ADBV are at essentially the same pressure so PSID=~0, and the amount of flow will determine how much the ADBV is "lifted" from the inlet holes. Since overall filter flow is limited by the exit diameter, and no normal engine can pump more oil than this hole can handle, you're never going to be able to generate the kind of force needed to collapse the ADBV backwards, let alone seal it off completely long enough to block flow. My interpretation may not be entirely correct with respect to physics, but its surely closer than the idea that the ADBV can block the PRV. Don't you think that's been tested, since this design is used by multiple filter manufacturers?
