HI Steeve,
Glad it’s finally working for you. As for instance index, the value should be usable for the duration of the game, as for saving the value to restore a state, you should also be able to use the index, unless there is something i’m not thinking (it’s been a few weeks i haven’t look at this code 
)
As for updating only changed/moved index, keep in mind part of the refactor that i did was exactly for this, as before it was always recreating everything from scratch when updating.
Let me know if you have some questions.