CSR is on a bell curve, so you're going to be placed where you belong after a time. But before that time, everyone needs to settle into legitimate ranks before any bell curve can be properly established. Hence why some people already have a 50, and others don't. No one has a legit 50 yet, because not enough games have been played world wide. Each playlist also has different criteria, such as CTF being win/loss, and Slayer being k/d. You for example are probably not rank locked, you just suck in those playlist given their criteria, on top of the dust having not settled on the system yet. And you can lose a game of Slayer and still go up because that's a k/d thing. Think of CSR as your Halo IQ. You get a score that represents your "IQ" in that playlist and leave. Increasing that score will take far longer and harder work than a linear progression system. This is also why some people have been dropped into numbers higher than 1 after several games (on top of the curve not evening out yet), because in a system using an IQ-esque bell curve, you don't go from handicapped to savant over years of work. You are what you are, you either suck or you don't.