This used to work, as I have seen it replace the lead patroller numerous times. I don't know when it stopped working, or why since I don't think we've touched Spawns in a while. But I set 3 of the 4 spawns to 0% and left the bottom one at 100%, and after reloading the World completely, that position does not spawn at all. So, Zero works
I'll continue to investigate. Just wanted to jot this down before I forget.