So first I'll answer your questions. 1: Can Frank cook? Assuming he somehow managed to learn everything without the food in hand, then probably. His first few attempts will probably suck, but then once he gets used to holding food, barring any lack of talent, there's no reason he shouldn't be able to cook, improvise his menu/recipes, all that jazz. 2: I honestly don't know. My guess would be not entirely. He could probably help someone learn the basic stuff, but then would obviously need someone else to help if they chose to apply it and were having difficulties.I see your point. It's a bit of semantics, really, "gradual" vs "progressive."
So, let's apply your model here to something outside of martial arts. I mentioned cooking before, so let's stick with that.
Person A is a James Beard award winning, Michelin star rated, classically trained chef. Let's call her Chef Jane. Chef Jane owns two successful restaurants and has worked in the field for over 30 years. She is a bona fide expert in the field, respected even among other successful chefs. She opens a school to teach people to cook, using a system she creates that she has called "Jane-cook-do." She rents a warehouse and sets it up with everything one might need to cook minus the food. She has ovens, bowls, mixers, plates, you name it. No food, though.
She gets a group of people who enroll in her school, and they meet three times per week for about 1 hour, maybe 2. They work through a very thoughtfully crafted curriculum that starts with easy recipes and then works up to progressively more complex recipes. Students are required to practice all of the techniques, from knife skills, to building up their baking muscles by stirring cement, to any other kind of simulation you can think of. Over time, these students gain ranks, until after a period of time (let's say ten years) they attain the rank of "chef." Most students drop out, but Person B, let's call this person Frank, is serious about this. Being a chef is his life's dream. After 10 years, Frank has never touched any food, but he has practiced every technique, and has memorized hundreds of recipes.
I'm trying to go out of my way to say that Chef Jane tried to think of everything. Absent food, she has really tried to deliver a thoughtful, comprehensive culinary education to her students... just without access to any food. Everything else has been taken into consideration.
Two questions:
1: Can Frank cook?
2: Is Frank competent to teach someone else to cook?
Now to address your overall point. What your talking about would be if, imagining Jane/Frank were martial artists, that she not only does not have her students compete, and/or bodyguard and/or fight, but also does not teach them how to spar. Which from your past posts isn't what I think you're getting at here.
I think a better comparison would be if Frank wants to be a chef, and Jane teaches him all the stuff, along with actually using food, but then never has him/he never works in an actual kitchen for a restaurant before 'graduating'. So he doesn't experience the high pressure environment, and there are no stakes to the food he makes in her kitchen (beyond whatever food he has to cook in front of Chef Jane for rank testing).