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A spun bearing turns the cap, a main or rod, black. And, the oil gets baked on the cap making it look bubbled and rough. Also, you will usually see a bunch of jaggad edges poking out from the sides of the cap. Also, the material in the pan will have a "squished out" look to it. The blue color is...

An easy way to spot a failure, if the oil isn't crude oil black, is to look for the darker colored rod or main cap. Same with an upper bushing failure. The top of the rod will be very dark or blue. Also, bearing material likes to extrude itself from the failure. Look for little jaged edges...

Bjorn, I've seen mains spin and cause knocks too and have even run them on the dyno and the only indication of the failure was white smoke out the breather under a load only and a knock similar to yours, down low. Usually, if a rod bearing fails on a diesel, the engine won't last too long...