That's not true at all mate.

I have no idea where you pulled that from.

When I'm queuing with LE/LEM players I usually get mostly eagles and few supremes and when im queuing with mostly supremes and few globals thats what I get from opponents. You almost always get players with one or two ranks higher/lower in your matches, thats my first time getting silvers or even gold novas. If it was the case that highest elo mattered only I wouldve seen that happen before.

MM Calculates hidden elo of team #1 vs hidden elo of team #2 and matches them together to be equal so if you have one global with high hidden elo you will propably get a supreme with lower hidden elo as well. If it calculated only the highest elo you would never get higher rank players in your matches. What you said is simply no true.