Greene.
Wouldn't want to give it to someone too young. If things don't workout, you could ruin their long term future with the team, or give it to the wrong person. Say we give it to Henrique now. In a couple years time a guy like Larsson, Severson, Santini, another prospect or draftee could come in and be a stronger leader. It would be kind of awkward to strip your captain for the likes of someone else.
Greene provides a nice stopgap. Also, there's no denying he's a tremendous leader. Likeable, doesn't make many errors, makes the guys he plays with better, especially younger defencemen.