I think Joyce can be considered as good heavyweight but not excelent by any means. I think he will become champion. He is pretty durable from what I have seen. His defense, positioning and power will see him trough against better opponents in the future.
So it's maybe Bryan, then Charr? Charr is 'well rested' but could probably use another year of doing nothing ... because it's the WBA.
Most likely because there isn't many to fighht and Bryan is rated higly. Bryan will probably fight again in summer if no fight with Fury. Charr would likely be next after Bryan but tough to say at this point in time.