I remain convinced that at the basic level a "gaited" trainer is not necessarily required to start a gaited horse.
There can be differences, though. If you are of the persuasion that says "gait" is "made" in training then, yes, a gaited trainer will be required very early on.
If you are of the persuasion that says "gait" is made in the breeding shed then you could easily come to my view. (Guess which tack I tend to take? ).