Killing the kings is a 5/5. Does a splendid job of off-ticking the kings, in case one of them is on the same tick as the others. The only thing that I've noticed, which can be somewhat of a nuisance, is that it will eat food, loot food, eat food, loot food. Say you have a full inventory of sharks, and you get a shark drop. It will then eat sharks from the inventory, to pick up sharks from the ground. I can see the idea behind this, if you're having lower-tier food in your inventory e.g. Karambwans and want to upgrade it to a higher healing food source, but if it is just replacing the same tier food, it seems like "time waste" in a way that it gives the dead kings 10 seconds more time to spawn, which in the end might result in taking one or two hits from a melee Rex, before it is off-tick again.
But again, for whats it is made for, it 100% gets the job done. Getting the kills and staying there for as long as possible. Inventory management, might just need a little polishing.