The Allosaurus is a very useful creature, they can be used for meat harvesting, base guards, kibble, etc. Allos are also very useful for bosses, I would recommend mixing some of these (preferably mate boosted) with rexes for the bosses.
I was cruising with my pair (levels 25 and 42) through that canyon on the west, then suddenly tek rex jumped off the cliff to roar at us. I didn't see his level at first so I was unsure and thought to turn around and run, but decided to stay and fight. I didn't fight him, I ATE HIM IN LITERALLY 3 BITES! It was level 4, didn't even take any damage and my other allo didn't even take part. If it's so, I presume I could take down level 20 to 30 rexes easy with these guys. I have a rec at home, but he's just for showing off, tame allow for business!
This dino is by far my favorite. If you can manage to find 3 120 allos you will be close to unstoppable. When you have 3 allos( doesn't matter what genders) the highest level will be considered the "alpha", this means the alpha can do bleed affects which causes damage over time as well as slows you down temporarily. When getting a pack of allos or a allo the only stats that ever need to be pumped is stamina, melee damage, and movement speed. Hope this helps! 😄
If you get a pack of at least 3 good leveled allos you can kill anything except for obviously Titan and giga our tribe has a few with 14k HP and 400 melee and with 3 of them we can easily take out alpha rex and other strong dinos, also they are a lot faster than most carnivores and not to mention the highest level gets an "alpha" boost where it can do the gash attack they do in the wild where they slow you down and make you bleed