If arreola turns up motivated and in good shape then I think this is a fairly good opponent for wilder. Arreola has proved himself to be nothing great but I think when he is on his game he is clearly a class above the "bums" of the division, for example his fights v Molina, Seth Mitchell and even the first round of his last fight(before he tired horribly). There is certainly worse opponents for wilder, one of the links in the heavyweight fight schedule thread had him rumoured to fight the japanese heavyweight champion :S....