I am forced to listen to Bp. Williamson, because, it seems, he has the words which lead one to the truth. He tells us that we need to do what Heaven says. Heaven seems to be telling us to pray the Rosary. His Excellency doesn't know why exactly this should be the case. But, like the Syrian general, we should simply obey humbly and "wash in the Jordan" of the Rosary. This is what we are trying to do. this is obedience to the truth in the present crisis.
On the other hand, Bp. Fellay treats the Rosary rather cavalierly. Even after inaugurating the 3rd Rosary Crusade for the Consecration of Russia, he expressed doubts that such a crusade would result in anything. He had little confidence that the Consecration would occur even in the wake of 19 million Rosaries offered for that intention.
Truth be told, the first Crusade should have been dedicated to the Consecration of Russia. I think +Fellay knew what Heaven wanted prior to the second Rosary Crusade in 2008. But he disobeyed Heaven. In the Spirit of King Saul, he did it his way, and lost his figurative 'crown.' Bp. Williamson is the rightful heir to the Lefebvrian legacy. Bp. Fellay is an unlawful usurper. Simple as that!