I would absolutely toss Bucky and/or Stone at Rosi for an explore.

And I think Stone is going to get serious about the world eaters thing (since Stone has no real personal issues to work through, unlike Buck, and can focus on such things) he's just... a very old version of a dragon-princess, so he doesn't have a ton to offer except exploration experience and steadiness :| And being really good at raising kids. Teach him useful things for the long haul Rosi?