Sunderland desperately need to fill the void left by Amad Diallo this summer. Amad Diallo showed Sunderland exactly what they had been missing all season last night, as he netted a screamer against Newcastle United. It makes you wonder how the Black Cats ever managed to bring such a talent to the Championship, and it makes it even more obvious that his absence has escalated their decline. Amad was way too good for the Championship, but the club never even attempted to replace him. Jobe Bellingham has plenty of potential and bagged seven goals in his first campaign, but he is a completely diffe…