I was referring to conflict when I said "it". In Jim's articles, I think he basically says there is no conflict within the RST. So, my example wouldn't be in the RST:
But, maybe, it could be a consequence of the RST?
In regard to currency, it could probably be used to define a relationship.
Also, I was thinking about the RST being subject to the circumstances of the OST. Relationships are often a product of our environment. For example: Speed.
Anyway, I think the takeaway is that the RST should add something that cannot be supplied by the three other througlines.