Something that also is not being factored in here or mentioned, and i didn't check the players profiles, is whether the ranked rounds being played are in RGs or other tournaments and the players are earning credits.
I moved up in every tier from pro to legend earlier than what the stated numbers were, but the majority of my ranked rounds were in RGs and the majority of my results were platinum or better, earning me significant credits and I guess trophies as well. I believe this is another defense to people who multi account and pass credits to new account for gear then come in and play credit earning tourneys and win.
I know these factor in to the equation