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G'day R man.
Reckon you're on track with the clean up and watch.
Can't think of anything which could leak engine oil in that place and must say it'd be a bit surprising (well to me at least) to have a directional spray from the rocker cover ending up there.
Maybe, just maybe, if the engine bay was a bit grotty, any other fluids could end up looking like oil but as long as all, ALL fluid levels are holding up O.K. just wait and keep a close watch.
Luck,
Col