Is penis size and gynecomastia (grade 7) related, in growth and development?

Gynecomastia: Yes they can be related, however without more information any answer here would be vague. It is very common to have small breast buds as boys pass through the early stages of puberty. As testosterone level rises in later stages it usually goes away. The testosterone will also promote penis growth. Determining if things are "normal" depends on exam of growth rate, testicular size, pubic hair etc..