I think each of them has their own point of view and should be asked individually. I chaired the human rights subcommittee, and I found that it was usually not helpful to have people from different organizations representing different points of view; the lines of questioning are frankly more confused than if you simply have them individually.
If your proposal is that we have Mr. Mayrand back, I'd have to think about it. It might have some merit. But I wouldn't recommend having them at the same time. It's different when you get multiple people from the same organization, such as Monsieur Mayrand and Monsieur Perrault. It's their job to have the same point of view. Hopefully they discuss it among themselves beforehand.
Thank you.