Oil is gushing out at a pressure, reportedly, of at least 6,000 PSI. Stopping it is the only answer. Anything else is just for show...
Dropping hay in the ocean may absorb some of the oil that's reached the surface, but not all of it has or even will due to the gusher being a mile under water. Also, the oil is very diluted, spread out over tens of thousands of square miles.
Again, the pressure of the gusher itself (not talking about the water above it) is likely over 6,000 PSI, so dropping rocks, mud, etc over the gusher won't work; pumping mud directly into the well is a different story, but the attempts failed due to the extremely high pressure of the gusher itself - attempting to force the mud down too hard would likely have caused the well casing to fail / opening a crater around the wellhead making the situation even worse.
The relief wells, once completed, will most likely shut the gusher off.
Ron
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