Could currents have carried survivors away?

Could currents have carried Sydney's survivors away from the search?

It is possible, although Kormoran's survivors drifted north and the small separation makes a completely different current less convincing.

Different currents could theoretically have separated the survivor groups. Kormoran's survivors were swept north, and the ships sank close enough together for a wholly different drift to be questioned. Lighter Carley floats and boats being blown farther offshore is another possibility raised near the end. Neither explanation is established.