Andy - I can share information, but can't send drawings until Thiel Audio's bankruptcy is settled.
You are correct; the 2.7 and 3.7 have 3 separate drivers with electrical crossovers, unlike the 2.4 which is electrically 2-way plus the mechanical mid-tweeter xo.
There is no time compensation in those crossovers. The coincident alignment is achieved geometrically via the position of the coaxial midrange and tweeter.