Conspiranoid theory aside for the moment, @Two-Tired did not highlight that oil is pumped from the oil reservoir through the transmission shafts into the clutch housing as well as through the filter onto the bearings. This happens when the relief valve is opened under excess oil pressure conditions. Any debris that is picked up in the reservoir may indeed drip into the pan (via transmission or via bypass) and ends up on the sump screen or bottom of the pan. Its very possible that the debris is a mix of clutch disk filings, transmission filings, gasket sealer,...as well as pussy material.