Nonetheless, the dreadnought was the fastest ship in the covenant navy. There is no way Johnson Keyes and Arbiter could have gotten back to earth beforehand and they did not take a covenant ship because they needed them for the flood quarantine and they would have used said ship to attack the dreadnought in the storm. Since the in amber clad was the only human ship at delta halo how could these three have possibly reached earth at all before the chief and the dreadnought?