ushumgal;
In terms of this situation, if there is a depression next to the recorder casing, it could indicate the direction in which the local currents tend to flow, and the depression was excavated by turbulent water from the current being forced over the recorder casing.
Your analysis is correct.
However, in terms of the various photographs we have seen taken on the bottom, I would venture to say that current movement on the bottom is virtually nonexistent. Go back to the original photos and examine the left-hand MLG. You will note that the rear wheels touched down first and turned about 90 degrees, picking up some sediment from the bottom. The front wheels dug in, and there has been no sign of scouring in nearly two years.