Did Theseus ship fail when any one board was swapped? Did it no longer float? Would it no longer have allowed them to "return from Crete?" No, it was maintained, not destroyed. In fact, what would have happened if the Athenians had said no we cannot change any part, for fear it will destroy the whole?
It would have withered away into nothing. The key here is that Jelling is the maintenance, not the Team.