O.K. - let's put it the other way around:
One learned all about music, composition, orchestration etc., but has no IDEA, doesn't hear any music withhin himself !
This fellow you describe is in the wrong business. If he doesn't have any ideas than what's the point? I have more ideas than I could ever count. They will be executed either well or poorly based upon my application of both innate gifts and compositional tools aquired from private study with a master and study of the great masters. This study (at least in my case) has brought me to the place of presenting my ideas a thousand times better than if I hadn't.
I don't understand why people wrestle so with the idea of study or rules. The greatest composers who ever lived were very well aquainted with these processes and taught them to others. It's all about the music - not the rules. Every art and science has it's foundational principles which may be bent, broken or abandoned. But one must possess something before you can discard it.