Arreola has absolutely no muscle tone what so ever.

Id bet his arms are the same size if not smaller than Cunninghams right now. Strip all that blubber off him and theres nothing left.

Cunnngham would have been a heavy sweating down to cruiser. Look at the difference in punch resistance between the cruiser and heavy version of Cunningham v Adamek.

Also, as for punch power. Cunningham knocked out Huck. Povetkin couldnt