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I thought the rig landed about 1500 feet away from the BOP.
The wreckage did, yes.
Shortly after the explosion, the fire killed the computer controlling the pods under the rig which were keeping in place. When these pods went off line, the rig was at drift for the couple days it took to sink.
During those couple days, the rig was pulled as the ocean tides willed. As the tides tried to move the rig, the only thing keeping the rig in the same general aria was the drill string. The BOP acted link an anker.
As a BOP is not designed to take pulling forces of that magnitude, the BOP was pulled by the rig while it was at drift and while the rig was falling to the sea floor.