Interesting points - I will have to check StH but I thought the psyker was trained by the Inquisitor whilst they were "involved" and not actaully sanctioned? Probably getting old and misrembering!
Alot of what you say makes excellent sense but a few other things into the mixing pot for how the Inquisitor handles the situtation
I am not sure that information on Acolytes and the Inquisitors staff is kept by the "Inquisition" - but that may be just my game where perhaps Inquisitors are usually much more independant free agents...........
if said Adept goes off for testing - is it not equally likely that he might just end up being ground up to feed the Emperor?
the Adept may well reveal things that the Inquistor does not want reveealed in the sanctioning process?
I agree the Inquisitor needs a good reason to sidestep sanctioning but I think it can be there - given that his once useful tool/ source of information / valued undering or even friend could be destoryed by the process. On the other hand he or she may feel its not worth the effort and have them killed to avoid being used against him?
I think the Inquisitor is just as likely to handle the issue "in house" whether that be training him or her (esp if the Inqusitor is a Psyker), attempting to have the Psychic bit cut out or execution as sending them off for Sanctioning - where all sorts of issues may arise and they may not actually be of any use any more?
nice description of the date storage etc ideas by the way - most interesting - thanks