Possibly the most useful creature to go caving with as his small size but large health and damage allows him to withstand onycs,spiders and scorpions haven't encountered a arthurplura yet so not sure how effective he is against it
These guys SHOULD work similar to a companion in other games. It should be able to wield a sword along with the ability to wear more than just a helmet. Having a tame that acts as a warrior would be very cool for battle in ARK.
All I can say, is that this gorilla is great at caves, just not the ice, the lava or the one in the top left corner in the snow biome. On mobile you can put hats on it, if you got a clown mask or glasses, I recommend using an ascendent hat, mostly hide or chitin due to arthroplueras annoying spit attacks. Level up melee damage and health, there you got a hairy gorilla by your side.