I did forget about the earlier meeting, and that is encouraging assuming Hartley lined up on Hawkins.
The second game at Etihad, Hawkins rag-dolled him on multiple occasions.
You neglected to mention that Hawkins kicked 3.4, took 10 marks (6 contested), with 8 of the 10 inside the F50.
Brown being on Hawkins late in the game (like you say) confirms that the coaches also thought that Harts was well beaten.
I think mentally, Hartley might find it tough on Hawkins in the Rd.8 clash.
I'd be hoping for Hooker or Ambrose, with Harts taking the resting ruck or Harry Taylor.