Host booting

While playing GoW today I came across an interesting dilemma. As soon as I joined, one of the players left. I asked one of my teammates if he said he was going to leave. My teammate said that that the host wanted to boot him because he was too good, and probaly went through with it. Then I thought: should he really boot him just because he was better. Now the score was set at 3-2 with the other team winning. Just for privacys sake, im not going to tell you the gamertags here. Now the good player had about 7 or so kills and the other guy only had 1, so the host booted not because he unbalancing the game, but because he was extremely good. Please comment.