WL doesn't preserve the information of a player's clan membership during that season. If I were to compile clan statistics, it would consider the player's current clan(I'm not sure if this is what people are looking for).
Yes it would be interesting. We couldn't use this as a proper clan ranking, but at least it would give further ideas. The same idea is used for MDL for that matter if i'm not mistaking.
Clan at the time of the season on the other hand wouldn't tell anything imo.
