Notice how at 78cm there is no motoguru on the left pec, but there is sumi on the cheek on the left side. At 82cm the motoguru is even and tight on both sides. Don't let the lack of motoguru or too much motoguru fool you. If there is no motoguru at a young age but there is sumi on the gill plate on that side, it will develop.
Thank you for the pictures.