Thanks a lot @Chatouille, it work just fine 
Thanks to your explaination, I understand a bit much how the data are working on multiplayer and the behavior of controller, game mode & game state
Here what I’ve done in the game state, it’s not perfect because I’ve got an access issue, but I wanted to test your solution as quick as I can
Then, in my controller, I pretty much replicated what you did in your screenshot and it work just fine !!
For testing purpose, I just enable the jump on the selected controller.
Oh, and to get my controller array, I get it from the node OnPostLogin from the Game Mode and I copy it in a variable of the game state, no more Get All actors of class 
I’ll remove this access error and it will be all good, thanks again for your help and also @Nawrot & @GarnerP57 