Assume a team-v-team game where players are A, B, C, and D.

A and B are on the same team, and win the game.

C and D are on the same team, and lose the game.

ELOs have been established, and are a fair representation of player skill.

A has an initial ELO of 300.

B's is 100

C and D are at 190 and 210 respectively.

The question becomes, should A and B both gain the same ELO for the win?

If yes, then A is effectively gaining more ELO, because it will be (roughly) calculated on a team average ELO 200 vs 200, not a 300 vs 200.

If no, then B is getting rewarded for skill they do not actually possess -- they are using A's skill to win the game.

Aaaaand, discuss.