McCallum did better in the early rounds v Jones than Saad would because he had a better jab than Sadd which he would score with at will, but his body looked really flabby at 175 and his conditioning would let him down which would allow Saad to land his power shots, I think Mike may be stopped late on in this one by the much stronger man.
McCallum gets hit with right hands because he keeps that left low. The other thing he does that is completely wrong for this opponent is those wide looping right hands and left hooks to the body from way on the outside. He'll get beat to the punch and getting beat to the punch by Saad Muhammad ends fights.
Yeah Saad is the man here. If they were born to fight the same weight it would be much more interesting but Saad's too big and hard hitting.