I cannot begin to count the number of rear main seals I have installed through the years, be it in new builds, or maintenance repairs, but I have never one time offset the rear main seal. I think that is some bullshit magazine myth. If the rear seal joint is going to leak, it's going to leak no matter where the joint is clocked. Also, I always put a small dab of high temp RTV on the ends of the seal and along the mating surface of the block where rear main bearing cap meets it. Has always worked and been leak free for me.