The WSJ report issued late Friday cites US officials who describe a plan already in place to disrupt any ship-to-ship transfer that would get the oil into Syrian hands — precisely what UK/Gibraltar authorities detained the ship for in the first place, at the request of the United States: 

The U.S. State Department is working to disrupt what it sees as the vessel's Syrian plan, according to a U.S. official. The State Department has been monitoring two other Iranian tankers in the Mediterranean that could pick up the cargo...

As we observed before, all the erratic maneuvering and circling by the Adrian Darya 1 in the past two days between Turkey and Cyprus has actually put the vessel in the vicinity of its original suspected destination for which it was accused of busting EU sanctions in the first place — the Syrian port of Baniyas.