Coppejans why not, but I don't think it would be good for Dzumhur to get a WC in a such strong ATP field. He would just be destroyed, I don't think it could help him to improve. He has not yet the level. Coppejans neither, but they aren't at the same stage of their career.
Uhm, Dzumhur's credentials are stronger than Coppejans in ITF events. And he had a fair showing in Melbourne, beating Van Der Merwe and taking Chiudinelli to a deciding set. They stand about equal chances of being demolished IMO.