Quick google search and it's saying "3 years over 2million" So you'd have to guess he's on minimum 700k. This is slight unders for him, he'd probably get 850-1m on the open market, but you can understand someone taking unders to stay at a premiership winning club.
As @BroncsFan said, Paps reportedly re-signed for 650k, we aren't just pulling this number from our butt (though the reporter might have been). The other points as mentioned in his post stand. And yes, every salary is guesswork but it was also reported Paps signed on for less because he had a head knock.
Regardless, it is interesting that top teams very rarely lose highly sought after players but bottom clubs struggle to retain them. Also, some players leave poor teams to go to better teams for less.
I am not blaming the players either, this is the way the system works and if I were them, I would be willing to take a bit less salary to stay at a club I like and to play in a winning culture. I don't know if I would be willing to sacrifice 400k+ a year for that though.
In any case, whether it is guesswork or not, it highlights the point of the discussion, the salary cap doesn't work. It is supposed to disperse talent across the competition. Well we currently have 2 teams that can win the comp unless injuries smash them.