Is it possible on a LS engine?

[Vintage Windmills]

To have a leak from the rear main seal and not have oil on the flywheel/flexplate? My Lq4 6.0 has been leaving a little spot on the driveway for over a year now always thought it was the rear main since the whole area around the cast inspection cover was wet. I pulled this cast aluminum cover today and the flexplate is dry. The inside of the upper trans housing where it bolts to block is also dry. I would think a leaky main would fling oil all around the bellhousing? There was a small puddle in the inspection cover but the whole area from one side of the oil pan to the other is wet so it could have seeped in I suppose. I could see the oil pan leaking on one side but the odds of both sides would be pretty low I'd think. Looks pretty dry up high by the valve covers. This has me frustrated