And logically, in the training part of the divemaster course, the Deep dive scenario should be limited to 30m (since the divemaster candidate has the same depth rating as an AOW diver), so taking the candidate below 30 meters (say 35m) is actually a breach of PADI standards, unless the DMT already has additional training (Deep Diver, TecRec) allowing him to dive to the max rec. depth limit of 40m...
Come on, this is a silly argument. By this logic, no one would ever be able to take "deep" training because they're not already "certified" to go to the depth required for the training.
Not sure where you are finding the "breach of PADI standards" in taking a DM candidate deeper than 30m. There is nothing in the standards that says "deep dive for DM candidate must not exceed 30 m."
Standards are explicit. For example, for Open Water Dive 1 of the OW Diver course, the explicit standard states "Descend... to a depth not greater than 12 meters / 40 feet." So for Dive 1 of the OW course there is an explicit depth limit of 12 m.
Can you point me to the explicit limit on the deep dive for the DM course?