"It is noteworthy that on the right maxilla, the fifth position is followed by a vacant socket, whereas in the left maxilla, the fifth position is vacant but followed by the largest tooth of the row in the sixth position."

In Fig. 1 & 2, it is the left maxilla of OMNH 79031 where the fifth position bears a tooth slightly shorter than the fourth and is followed by an empty socket. Is that the specimen you're talking about here? Or have you just confused left and right?