Unfortunately, I don't remember exactly who said it, but someone on the portal already expressed an opinion about this, and I absolutely agree with them... The clan rating should be calculated based on several strong players... for example, 5 of them. This will show the real strength of the clan (because these are the players who participate in Tournaments). This way, the clan won't suffer from "dead souls"... And it will give beginners a chance to play without worrying about the rating...
However, Natasha's proposed system can be considered an alternative. Moreover, not only to the clan rating, but also to the "tournament" one, along with the "current" one.
And a cumulative one is definitely not an option... Strong players in a small clan will have a lower rating than those playing much worse, but in large numbers.... something isn't right about that....
In principle, the idea is correct. Only here, not all clans play all versions of Heroes, so how should we calculate? And calculating based on all players if they basically don't play this version is not quite right. It is better to simply sum up the ratings of the clan members. IMHO.
P.S. I would really like to know what VDV_forever, IronAxe, AmberSoler and all clan leaders think about this...