Are you sure that they will replace the Thureophoroi with Euzonoi? I had the feeling that unlike the rather prominent Thureophoroi the Euzonoi is only seldom mentioned in the sources. Thus the EB team wanted to supplement the Hellenistic armies with the latter. Probably not including both in every hellenic faction. If EB2 retains the "High-end-Thureophoroi" there is a viable place for the euzonoi, seeing as these are significantly lighter than the "door-bearers".