Alright, in studying this thing, the plate is just a cover that allows the flex plate (flywheel) to be inspected. I suggest everyone that went offroading that day, take your plate off and see how much sand you have up there. This plate is not sealed on well by any means, so I think it probably happened to everyone's.

The good news is, the leak is not transmission oil. The bad news is, it's engine oil. I can't find any other place the oil could be coming from (like the intake manifold), so 99% chance, it is a rear main seal leak.

-Scott