I remember once I had a teammate who had a similar really positive score, something like 10+/2/3 and we lost horribly. Why? Because they never grouped or help the team push objectives. They were also split pushing or farming a jungle mob when we were trying to defend towers, contest dragon, or push a lane. The sad part is even 4/5 we'd come out of fights with like 3 kills and 3 deaths and the surviving people all being like 1/6th hp. The fights were so close even at an number disadvantage and we were able to hold them off for so long that while our scores might have been 3/8/20 and 11/13/10 and 5/3/9 and 5/6/1 we still lost because the person who had such a great score was a major ass and refused to work with us. I don't know the specifics of your game, but you don't always know best just because you have a "better" score. K/D/A is relatively meaningless. I'd rather have a teammate that is 2/3/5 as opposed to a teammate who is 20/8/3. If you haven't noticed, this game is less about how good you are and more about how bad your opponent is. This game isn't typically won on awesome plays, but rather mistakes made.