In the end, Sauron only prentended and let the others think he had been driven out to lull them into a false sense of security. I think it would have been more about inner strength rather than physical strength - think of Glorfindel driving the Nazgul into the river or Gandalf "fighting" Saruman or the Balrog. I think they watched Dol Guldur more like spies than standing guard.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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