Its possible to teach pretty much any subject, but the problem is some people just learn what they are taught and take it no further, they dont have the inquisitive, competetive nature, so wont get as far as someone who does, assuming they both had the same resources and training available.
You raise an interesting point there Ken. I've spent almost my entire working life in TV. And thus I've 'always' been surrounded and mixed with creative people. Around seven years ago I was invited to lecture at Stow college. There I joined a department staffed by fellow creatives; musicians (some quite well known), producers, sound engineers, graphics artists etc. Desite coming from different disciplines we all share a common 'hunger' and passion for our respective subject....
A constant source of 'bafflement' and frustration is the stream of students who don't have a creative bone in their body. They sign up for video production courses or music management courses 'in love' with the notion of joining what is perceived to be a 'glamorous' profession. (if only they knew

) Yet seem unprepared to have to go beyond the basic 'mechanistic' processes required to evidence their completing the course.
They lack the 'hunger' required to master the discipline and the imagination to progress it.
I see parallels in other fields. I have an elderly uncle who arrived here from Hong Kong in the mid-50's. He's been in the restaurant trade all his life. Ran a chain of 'high end' restaurants and still, at the age of 81, actively runs two. He's had interests in all sorts of other businesses, from garages, shops ..even a Vet's surgery! A trip into town with him is an education. He still ferrets about looking for empty shops and flats 'going cheap'.... And for 'sport' he buys, sells and 'collects' expensive watches and pens; as well as amassing a rather valuable collection of these things reckons he makes around £7K a year on his activities (more than many people of his age have to live on).
My cousin (his son) is a feckless woose who has ran every business he had into the ground!
Thing is my Uncle is 'still hungry', still enthusiastic and still sharp. He 'learned' from growing up in a penniless family to work out what the value of things are before the price of them. My cousin never learned that that lesson... Certainly he had it taught to him; but at the end of the day always 'knew' he'd have a roof over his head.
Is it nature? Is it nurture?