Juji - centre chest point

Akuzawa sensei talks a lot about the juji, the centre point of the chest. Why is this point important? I think it's important for the correct posture and it must relax and drop to connect and hookup to the lower spine and tailbone. If the chest stays up and does not relax then a person will never be able to connect their upper and lower body. Softening and dropping the juji point takes the gravity point lower into our body and helps us to understand in more detail the natural structure and inherent potential of our Bujutsu frame and body.