My average has been 63 since I turned master. Has never gone lower or higher. Went from master to TM to legend within 2 weeks, so the 61 average theory for legend is incorrect
For the upteenth time, there are two very different paths to advance in tiers.
1. Required ranked rounds + required average score. Meeting these requirements guarantees advancement.
2. Play a boat load of coin room games until some secret criteria is met.
I also fall into the latter catagory. Tour Legend with less than 300 ranked rounds.