Correct. Dermie said that you need one guy to play on the gorilla in each team. He doesn't have to be the best user of the ball and you can't have more than one of them in your back 6. But you need one against most teams.
He also said that because Hawthorn have lots of good users down back, a gorilla killer would work. But it would not work for say, Richmond, because they don't have enough good users of the ball in the back 6.
I thought it was well thought out and pretty well on the money. Hawthorn and a couple of others would be a fit