In Harry Potter and the Half Blood Prince, when Fudge went with Dolores Umbridge to arrest Dumbledore for supposedly setting up the "Dumbledore's Army", Fudge brought 2 Aurors (Dawlish and Shacklebolt) with him. Why didn't Fudge bring Rufus Scrimgeour, as the latter was supposed to be the Head of Auror Office during the events of Harry Potter and the Order of the Phoenix? Also, during the final duel between Dumbledore and Voldemort in the Ministry Atrium, the Aurors again were sent to arrest the captured Death Eaters in the aftermath of Battle of Department of Mysteries. Where was Rufus Scrimgeour?
Why did the other Aurors show up in books 4 and 5 except Rufus Scrimgeour? I recall from Harry Potter and the Half Blood Prince that Rufus was first introduced as the new Minister after sacking of Cornelius Fudge. So, that means in book 6, Rufus seemed to have come out of nowhere. So, where was Rufus before book 6?