I don't think just the cooler would do much of anything without water flow. I think the point was, as discussed here and elsewhere, that the actual efficacy of the oil cooler is quite limited, and any failure of core would be catastrophic and the risk outweighed by the benefit. But on one of my W50's the cooling is accomplished by the freshwater side of the system. On the other W50 it's connected to the saltwater.
The upshot seems to be unless you go for a larger, freshwater cooled unit, the pittance of heat dissipation by the stock oil cooler accomplishes little in the overall scope of things.
Hence, plumb crankcase to oil filter assembly from each side and Bob's your uncle.
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