On leave doesnt matter, its just random chance. Check the other guide, you will see the spawns cycle randomly (which is the idea behind farming an area for larger spawns). Generally you have to end up going back to combatant, otherwise eventually factional NPC spawns and lock the cycle. As happens to me almost every time Im there.
Up north you usually get reb spawns, down south you usually get imp spawns. I've made about 30 jetpacks and spent far too much time all over yavin
Im going to nay and lock this, as its the same process as the other guide, just a larger area covered and the on leave part doesnt work.