True: Naming a player may be against the Posting Guidelines ===>
It's a different path, apparently. In the mobile environment, where mobile games are all "practice", levels replace the RRs as promotional levers.
I've yet to see a high rank with an 150 ave. (*), but, via PM, I was shown a TC with 12 rounds, L103, ave. 58.x, the only RR on the record played last year, as a Champion.
Promotion by miracle?
Looks like there are too many hidden rules and mechanisms at work to keep track and to explain from here.
(*) pointing to "no ranked rounds at all"