Yes, that's why the suggestion is that CFIs match mentee with mentor. It is the CFI in a training establishment, is it not, who should monitor suitability and efficacy of training?
The main point, however, seems to me to try to create an examination regime which really tests logical thought, synthesis of argument from relevant data, rejecting those data which are irrelevant, and cogent decisions for future action. These, along with the ability to communicate in what is, I understand, the international language of aviation, namely English.