It's at their discretion. With the way the bill is constructed right now, in the context of final offer arbitration, the decision the arbitration panel would be making would be based on the information provided by the two parties in their two offers. That's the information the arbitration panel would have in their possession.
What MP Julian is proposing to do is to provide an opportunity or a mechanism to the commission, if it were in possession of other information that it thought was relevant but that was confidential, to share that with the arbitration panel.