Re: skills and training.
Just because someone has the coveted skillset does not mean they're qualified (much less obliged) to train others. If the training fails to take, for whatever reason, it's likely to backfire on the person who trained and not the learner, who can easily and defensibly claim that the training was ineffective. For that reason alone, I would decline to train someone else on a specific, difficult to learn skill. Particularly if training in that skill is offered by other outlets (university, night classes, internal formal training) from trained instructors.
That said, mentoring another person on some aspects of a specific skill is often part of the skill-holder's job. This doesn't mean training them to do the skill, but rather informing them as to the value of the skill, understanding how the skill fits into the job, and how to obtain the skill if desired. FauxFoodist has done this, and that's all that should be expected from management.
FWIW, I once mentored someone on aspects of my own skillset, and that person later went on to claim the same level of skill as I had, despite not having the degree, formal training, or even anything more than a very superficial understanding of a few of the concepts. I had to escalate to upper management to get him to stop claiming expertise because it was confusing people (when he gave them wrong information). I can't imagine what that would have been like if I had 'trained' him.