I kind of understand what you're saying but it sounds to me like you're referring to muscle striation and muscle development as two process that the muscles must undergo through time. However, muscle striation is a structural characteristic of all skeletal muscles (such as Z-line, A-band, etc.) regardless of development (see Hung's picture above). Muscle development requires time (there are exceptions) but muscle development is not a genetic characteristic of skeletal muscles. I've seen a few skinny people who have visible muscle striation but lack the development but most folks who don't lift can't achieve a low enough bodyfat for striations to show anyways because most of them are considered skinny-fat.