Hello!
The ID, at least for now, is just in case you want to use static DOTween method on your path via its id, like DOTween.Pause(myId)
![Tongue :P](http://forum.demigiant.com/Smileys/default/tongue.gif)
EDIT: saw your edit after answering, ooops. But yes, when you call a static ID-based method, all the tweens with the same ID will react.