440 Harmonic Balancer Timing Marks Off

TDC is TDC regardless. You could put the cam in backwards or throw it in the trunk. The timing marks would line up when you're at TDC nonetheless. Your insulator may have slipped.
I agree to a point, but unless he is positive the cam is timed to TDC, COMPRESSION STROKE on #1, he could be on TDC comp stroke #6.