well, if what you say is true. about the Father/son Pass-it-on theory, im sure it has to be Ezra.the description for vens training in 'Nalsheen' are located from the bottom of page 248 through to mid-page 251 of the book "Traitor General"
ven's training began at age of three or four(not clean in the book)
the 'Nalsheen' training has been passed down from father to son from the first settlers of tanith, it also explains about why they chose the old form of imperial gothic as there secreet language, and it describes his 'teacher' as the old master in the nalwoods.
hope that is clear enough