Well if I wanted to use your argument and reverse it, the fact that the Warriors managed to get him on genuine unders is no more an established reflection of his actual value than the Newcastle offer. In fact I'd suggest that the clause we're looking to exploit means that the Warriors well and truly understand they've got him on huge unders.
At the end of the day, his actual value to us is whatever we offer him, plain as that. I completely disagree that 350k average is anywhere near the massive overs you're suggesting. The guy has had an injury, sure, but he's an international hooker coming off one of his best years. We have a desperate need at hooker and he'd fill it nicely.
Just because he's on unders now doesn't mean we can also get him on unders as a result, essentially.