Spawning him - I dont know about all the bugs and or unusual spawn times BUT : It used to be, you could go into the cave, and pull 2 minos from the cave. If you dragged them all the way accross that field of yard trash, there is a tree there. It used to be you could kill the 2 at that very spot. I witnessed a guy do it over and over. It might be because he killed 2 in a short time, but doing it any other way did not spawn the hero, only killing 2 in that spot spawned him. He would even appear right there.
Its funny, in 4+ years they actually change very little, but this spawn always seems tinkered with.