I totaly agree LHM, in my case, running two PCVs with exsessive blow by, then add your theory, my "bad" rings on the one cylender, turned it into a breather
sorta
all I know is my engine quit pissin oil out of the front crank seal once I added a second PCV = bandade
On my current engine, 454, I run a breather on the pass side and PCV on driver side
