I am very careful with picking mentors and I generally just trust them to do their job. :-) It might not scale well long term, but that's the problem I don't need to solve right now. Right now if some lead tries to go directly to mentor, mentor always 1. Reports it to me; 2. Tells this lead to pay through mkdev.me.

It's simply much more convenient to mentor through mkdev.me than to do it on ones own.