Although I'd love for the Panthers to extend him, given Martin and Tago are already locked up for next season, Capewell's money helps them extend JFH and Api.
An article the other day said Capewell is currently on $380K with Penrith, and the Cowboys offer is $400k. Plus there was an article last month that said that Brisbane had offered him $450K.
With the shortage of quality 2nd rowers on the market for next year, if he has 2 more decent origin games this season, I think a desperate club will offer up to $500K to get him. And that would be too much for the Panthers to get close to.