1. Bans are never personal, sometimes I had to ban people that I like, just because they broke some rule by getting angry or something. As above, it's characters getting banned not players, except some extreme cases.
2. I never post proofs and describe how my investigation looks like, because players who do FR/dual in PvP could exploit this knowledge and I believe that none of you wants that, and also I don't want my sorry job harder.
3. Sharing characters is risky and all sorts of dramas and problems come from it. I wish that people didn't share their characters, but I know it's not possible.
4. I've reviewed this case three times already. I got two separate reports from two different people most likely playing in different teams. It looks like an obvious fast relog. If you play from one IP, characters come into fight one after another, and previous char is logged out after he dies, then what can you expect? I don't assume that everybody plays PvP with his bro/sister/grandmom/dog because if I did, then all people would be free to fast relog all the time.
Some people that even don't play PvP but only PvE inform me that they are playing with brother or son, just in case. And then, I can easily check it anytime they are online.
Players that play PvP almost never inform anyone, but after ban, suddenly 90% of them plays with bro.
Btw similar "brother/shared char" case here
http://forum.fonline-reloaded.net/index.php?topic=10035.0