PS: I just see that my NS Zombie was in my top 5 back then, and I haven't upgraded her except for adding one level and a single piece of gear. Her GP is now 5842, which should be pretty close to my average top 5 character GP back then. Compare that to my 12,800-ish opponents. On node 2, mind you, not one of the final nodes.
ETA: Also note the team's composition. A full Nightsister team with Old Daka, Zombie tank, and Asajj lead (speed & offense bonus plus enemy turn meter removal). Usually, GW teams are relatively mismatched, but that isn't the case with these unexpected brick walls. This looks like the arena team of someone who is far above my own level.
