Naish might eventually play Houli's role but could also be an outside mid/winger, though he might not be his immediate successor...expect Grigg will either be replaced by another mid or even a genuine second ruck....
Do you think Lynch could do the ruckwork for short periods during a game?
Or even with Jack, just in our forwardline, with McIntosh through the middle and in defence with help from Astbury or someone in the backline?
An extra classy quick midfielder on the wing would help I reckon than another bits and pieces backup ruckman.
Unless you have a Max Gawn that can do more than just tap work, ruckman are overrated imo.