Yeah, the points you gain or lose is based only on the strongest player on the other team (99.7% sure) and your ELO. This is a big reason why ELOs are “inflated”. Played a game where we faced a 2700 and some smurfs/low rates, all the players on my team lost 0 points (1900 to 1400) while I’m sure all the other players gained a ton (other than the 2700).
Every player should theoretically get the same number of points on a team, only problem is that it will take way too long for decent players to get up to 2k which is where most decent players are these days.