On Gagai, honestly he should be the bait we send out in order to get a fullback. Cronulla probably fancy themselves as having a shot at winning the comp but they play a utility at left centre for example, who hasn’t disgraced himself but it’s not really his spot - If they look at his highlights playing on the left side of the Souths backline they might be tempted to take him on.
Just sit down and have a chat with him - look Dane, we thought we’d be in a better spot than we ended up being in when we signed you (didn’t know Pearce was leaving at that time for example). We’re re-tooling and there might be growing pains. Do you want to stick around for that?
Then if he’s got that same itch which drove him to Souths again, the desire for guaranteed finals footy, offer him up (with an offer to eat a small amount of his deal) in exchange for - plot twist - Will Kennedy. Sorry but Lachie Miller isn’t proven, and I am pretty sure Cronulla wanna transition to Dykes anyway (Kennedy off contract at the end of next year).