The armor locus edge, which is a legendary, looks just like aviator csar, which is an uncommon.
Im not saying that they look alike, they are the exact armor with different paint jobs…
There does appear to be a lot of redundancy with the armors. Hopefully when Halo Infinite comes out, we will have more customization opportunities. I believe they mentioned something along the lines of if people liked customizing in Reach, they will be happy.
You’ll notice that with a ton of different sets. I noticed a while back that a large portion of the sets use the Recruit forearms and legs.
That’s one of the problems with having too much armor in the game. There’s only so much you can do to variate them before things start looking too similar.
It’s because in Halo 4, Locus, along with a few others such as Scanner and Deadeye, were only helmets. So in Halo 5, they needed a matching armor, but apparently 343 didn’t care enough to give them original armor designs. So Locus got re-skinned Aviator for armor, and Deadeye got re-skinned Fotus, etc. It’s disappointing because Locus was one of my favorite helmets in Halo 4, so I was excited to find out it was getting its own armor until I saw what it looked like 
Yeah, a lot of Armor in h5 look the same they just added spirals or polka dots to make them look different. But im excited for H6 new armor they said fans of reach armor will rejoice.