Just on the talk of 77K vs Skipper, doesn't seem to be much consideration to a DP structure in 4th ruck slot. If you were going to sacrifice 77K, why not pay 89K and set up a DP link so Tippett can cover both onfield rucks. Will allow you to play a fwd bench player rather than a ruck bench whenever you get a ruck injury.
For 3 ppg it could be worth considering. The obvious issue is you need to be comfortable with Tippett paying his way as a forward. The other way is to leave the Lobbe link in place early with no premium ruck fwd and trade Tippett or Petrie into the fwd line when they drop in price so you have DP coverage for the back half of the season when the carnage will hit.
I agree Dogs. A 77k ruckman at this stage looks like 77k that will be wasted. Spending a little extra on a player who should play or a player that provides a dual-position link is worth the extra money IMO. At least that way you're putting the money you've spent on that position to some use.