Allos DON'T stay alone until another allo gets close enough, instead they will always spawn together in packs of 3. When an allo finds another allo they will join forces and form a pack, because it is coded in the game that dinos tend to wander near other dinos of the same species. The highest level allo becomes the leader once the pack reaches a size of NOT 3 BUT AT LEAST 2 allos. A pack of allos will usually follow each "others" no matter what, since it is coded in the game that if any dino gets aggroed then goes to a location, any dinos near that one will follow it. IF WILD They usually follow the leader, if tamed they will NOT passively follow the leader but can follow a different allo if say a plaver calls over that specific allo to follow him If they wander too far from each other the bond will be broken and the allos will set off on their own until they find each other again or other allos. Once a pack reaches a certain size the allos will stop accepting other allos in their pack. The same goes for tamed allos. Once they reach the max pack size of 15 and more allos are introduced your original 15 allos and the new allos will form different packs. Hope this helps you understand allosaurus pack behaviors and pack animal behavior in the game in general as a whole. Thanks for reading.