A look at the log of this player make things crystal clear. Stays offline rest of the time and suddenly appears from no where when there's an attack. It's pretty interesting. I have kept an eye on his online times for acouple of weeks, he only comes online during attacks. No other battles. Not even enrolls. If you see his battles, he goes on auto as soon as the other player dies (when there are almost no chances of winning).
Possibly, this character is being managed by this player at the moment-
Please look into this,