It sounds like you have identified the areas/places that need attention.
Tight hips can effect everything down stream and limit your ability to perform certain movements or ranges.
With limited internal rotation, external rotation or both will result in your body making compensations in other places to feed slack to the hip to perform a movement or skill.
Limitations at the hip may be where ankle problems originate. You see the issue at the ankle, but this may not be the root cause of the issue.
Improved sliding surfaces and skin slack= less stress within system when moving. The movement is less expensive to perform when sliding surfaces move as they are designed to.
Tight heel cords can impact aspects up and down stream from compensations within the system.