Yeah, there's a lot of logic fails in this chapter. One of the fails here is what were the gods going to do if their original plan had actually worked? Presumably sending Arlong down to the mortal world was supposed to help him reform or something. You would expect that afterwards, the gods would take him back to the divine world. So since that plan failed, what not send down another god, maybe one with some more combat ability than the god of entertainment, and then bring that god back after he beats up Arlong?