SouthernSlam: Somebody please tell me how a player starts in September 2017, has 205 ranked rounds, and makes to Legend tier on January 2, 2018. Something don't look right here.
They could be migrating from Facebook. They could have played a lot of practice rounds and only completed ranked rounds that they had decent scores. They could simply be good.
While that's fairly quick to get to Legend tier, it's not really all that much of an outlier. From what you posted, I don't see any real red flags or anything that doesn't "look right."