Calculating the rating for clans!

Oh come on, you're really going off topic here.

I almost agree :) Because if we assume hypothetically that over time some people will leave Clans, others will move around by leaving some Clans and joining others, then what will this Clan rating reflect when people leave their results in one Clan and then earn a rating for another. In my opinion, it is impossible to do without aging of Clan ratings :)