A leaky RMS would be dripping right down the centerline of the engine where it mates with the tranny.
From your pics it looks like you're safe !! :dance:
It could well be oil migrating from the drain plug (btw - you can reuse a crush washer once w/ a 90% chance it won't leak - if you invert it, but it's best to replace it being as cheap as they are).
But it could also be oil leaking from the filter cannister (did you replace the 'O' ring?).
Or worst case, a leaky cam cover - involved, but not expensive.
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