Honestly though, rank was broken in 4. And in Gears before that as well. So logic seems to point to rank not really mattering to most that play. Because sure, my son was a Diamond 4 in Gears 4 and I was only Onyx 2. But I regularly outplayed him. I was MVP more than he was. Ahead of him in the scoreboard very often.
I even carried a team of myself, Onyx 1, and 2 gold and 2 silver to a win over 2 diamond, 2 onyx, and a gold. I was 31-1 in that match. And ranked down to Gold 3 in Gears 4. Oddly in 5 I was ranked higher with 3-2 in a mode than a friend who went 5-0 somehow. And I did not play as well as they did.
If rank matters Gears probably is not your game.