You have Rosas, Hayes and Hobbs coming through, with not too many players too move on.
Grundy only had the one bad score, Whitfield looks like more of an issue, although, probably worn some price deflation already. Luke Jackson is more of a question mark and at a minimum move forward.
Now is time to upgrade not sideways.
I think given limited downgrade spots you want to maximise capital release, would be think Sam Hayes over Preuss.
Some options:
If saving trades/money this week, Rowell to Green.
If wanting to be more aggressive:
round 6
Luke Jackson to Preuss (assuming he is back), or go early on SHayes or preferably bring in Rosas and move Dixon to rucks.
Rowell to Macrae
Play Hayes at R2
round 7
Dixon to Sam Hayes round 7, Dixon could be dropped by then or closer to max price at $260k given he is a 60 players.
Round 7 also consider Rachele/Dow to Hobbs.
Daicos back for Gibcus, bring in Oliver.
Sam Hayes is your R2
Then you can sit on Jack Hayes if you prefer waiting to go up on Ryder out times, or chop early.
Ultra aggressive
round 6 - Preuss/Rosas/Rowell for LJackson/Gibcus/Macrae
round 7 SamHayes/Hobbs/Olivier for Dixon/Rachele/Dow/JHayes. Slightly better cash balance into round 8.
Just some alternative thoughts.