Poor chin and mandible growth due to mouth-breathing - should I get all of these procedures or skip one? (photos)

Your intuition is correct, you need both bone and soft tissue reduction. This can be ideally done from a submental approach where both excessive tissues can be removed.

 thank you for your question. I would seek a consultation with a board certified oral and maxillofacial surgeon. Based on your profile image, the issue is as much with the position of your jaws as it is your chin.   A surgeon can only make a chin look so large. Giving you an over-sized...

Thank you for your pictures.  There is little that can be done about reducing the soft tissue of the chin.  The bony chin can bed reduced to give the chin a smaller appearance.

Thank you for your pictures.  There are several ways to diminish the appearance of your chin.  Reducing the chin is one way.  A personal consultation would go a long way to getting the most appropriate treatment for you.

Thank you for you pictures.  Your facial profile looks good to me.  If you desire a smaller dimension to your chin then a reduction genioplasty may be appropriate but it depends on your exam and expectations.

It is possible to create chin cleft or a dimple in some patients. You should be very conservative in your expectation, however. A  consult with a board certified plastic surgeon in your area and clinical evaluation would help. Good luck.