Mixing unranked with ranked players ....

You place in the arena and want teammates that are at least your same rank, right? So why does 343 put two unranked/unplaced teammates on your team? Can’t unranked players all be on the same teams until they get placed?

Am unranked teammate is like a REQ card, and if they’re not as good as your ranked teammates (and competition) you’re going to lose the game and maybe a rank. Doesn’t this mess up the ranking system just a little bit? And this is going to get repeated every month?