Probably not very good but who the **** knows really... Parker and Dubois are both coming off bad stoppage losses. Joyce at least went the distance against Chisora and Hrgovic and had moments in both fights. He might be able to pull through on psychological edge alone if his durability and stamina are still there for him.
Joyce's punch resistance is finished now. Dubois would savagely KO Joyce if they fought. Parker would break Joyce down eventually. Funnily enough they were actually both very good wins against legitimate fighters, in which it aged well.