A striking feature of the current state of Synoptic Problem studies is the almost universal acceptance of Markan Priority. If Mark was indeed used by both Matthew and Luke, this reduces the number of simple solutions to the Synoptic Problem to just two: Luke used Matthew or Matthew used Luke. Studies promoting the latter option, the Matthean Posteriority Hypothesis (MPH), have recently begun to attract wider critical attention. This article examines the three critical responses published sivnce 2017 and asks which of the problems so far identified presents the most serious problem for the MPH.