The idea that when selecting a group, I’m actually just selecting an object, is counter-intuitive, and this was my big mistake haha worse that I was still questioning myself, why did I need to choose a group to create an object per variable… ADHD rules! 
Thank you!
About edit: from the moment I manage to register an “ID” in the object, I think I won’t have problems with events in other blocks. As a last resort, I reuse the idea of collision with an invisible object with simultaneous spawn.