Sometimes 2 (or more) mobs will spawn in the exact same x,y,z, and thus there is a "chance" modifier on their spawnentry (like Theeper said). This is a provision for creating rare spawns. Sometimes Raster, most times, something else (shrieks and kills self at the mention of _his_ name).
Glad to see you worked it out. Yes, "timeleft" is another variable that (far as I know) should be relative to respawntime... but maybe not. I was noticing this with Nagafen today on my server. He's down, so I went to see when he'll be back - something like 60mil milliseconds from now... 18 hours or so, I think I worked it out to be heh. So, I think it's working.
Kinda confusing though, if the wiki is not clear.
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