When adding the buttons to the button bar, if like me you need things to line up correctly, and have a nightmare with the scale and position of the sprites whilst maintaining the Hitbox2D position and scale, then simply add a child object of the button, and have the sprite on there.
Basically the same technique shown when creating in actual Attackers/Defenders, not only does it make the buttons easier to place, but also means if you choose, you can add other aspects to the ‘Button Object’ such as background panels etc.