I don't think it will be canon, because I think this will probably be a standalone game to prevent the writers from having to commit to answering what the "true" path was. (Although we had 1/3, 4/5, 6/7, 8/9, and 11/12/13...)
This is literally what I came here looking for since it seemed to me to be the most significant bit of all this lol. Nobody's talking about it, but I'm wondering if you can purchase units for your streetpass team or hire generic mercenaries to fight with you. (Remember how your army would be filled out with generic units in Shadow Dragon if you got too many people killed? Maybe this is something like that, or maybe it'll be the way for us to get staff/rallybots in lieu of spotpass teams.)