Hmm forgot Vardy. If fit he'd probably take the Walker role as forward/backup ruck.I wouldn't be surprised if we play one of Hmac/Simpsons as first ruck (whichever isn't injured at the time!), being backed up by Blicavs and Walker. Blicavs could play across half back when not rucking, and Walker as the third tall forward. When first ruck needs a rest they slot down forward and Walker goes in to the ruck.
Thus a forward line something like
HF: Murdoch Hawkins Walker
FF: Bartel Clark McCarthy
If we want some additional speed/forward pressure in the forward line, move Bartel into a defensive role and put Motlop inside 50. Motlop/Murdoch/McCarthy would make a great crumbing combo too.