This. Although I can make excuses for Hawks and Pods - Hawkins was clearly shot, and Pods stayed on a year too long.(In last years preliminary final, Hawkins & Podsiadly were both held to 1 goal combined while Vardy & Blicavs were clearly out of their depth against Hale & Bailey)
Playing one less tall forward and all three ruck options against Hawthorn makes total sense to me, because if McEvoy holds his own in the ruck, it releases Hale up forward and we don't want that.