What is "the cost" of limiting the game plan and decisions he needs to make until he has the experience and knowledge needs to go full throttle?
Not sure I can see that as a negative thing, it's done with just about all rookies, or first hire employees in any business. The expectation is, in time, they'll be the ones teaching the new hire. If the game plan looks the same two years for now, then we probably have a problem.
For now, the job of the coaches--the boss--is to put him in a position to be successful with what he has and to learn as he goes.
Job accomplished yesterday!