I recently reached the higher levels of ELO (1300+) and for some reason people's behaviour changes at this tier. Whenever I am about to KO someone, they leave the battle, and sometimes even when they realize they can no longer win, they leave the battle. Why is this? Is there a points benefit to leaving the battle as opposed to being KO'd? If that is the case, I think the scoring needs to be revised.
No. The only benefit to KOing is adding to the missions, and the prevailing view is that you shouldn't aim to complete those missions, they should just be completed with passage of time. If elo score is all you care about, don't worry about KOs so much.
Some few people might do this for trolls, but most people "leave" the battle to save time.
Likewise some people might "time out" just to bother you, but most people time out because they have lost their connection.
I don't think penalizing the "leave's" or the "time-out's" would be doing justice for those who had legitimate reasons.