Here would be my choices (in alphabetical order):
Cody Glass- CAN
Eeli Tolvanen- FIN
Jack Hughes- USA
Vitali Kravtsov- RUS
Martin Necas- CZE
Filip Zadina- CZE
If they were not captains, I think these six would be on every reasonable roster, which is what you want from your captains. There are other candidates of course, but I don't think there are any glaring omissions.
EDITED: Tolvanen in for Heponiemi since he's been loaned.