Oh I'm not saying that's the problem, just telling you what's over there. As for how easy it is to check - simple. I think there are about 8 screw/bolts, not torqued, no gasket. It's just there to keep the dirt and grit out of the driveshaft and cover up the starter motor.
If I had a big oil leak, and it wasn't the oil pan, I'd pop that cover and see what's up.