You do realize your argument here contradict itself?
I don't see how it contradicts itself. The easiest way by far to rank up in these game modes is start a new team and play 10 games without losing. This will guarantee you a hugely inflated ELO compared to what you would get by playing those same games with an already existing AT due to how the game predicts an ELO after 10 games with no losses.
If you get an initial ranking within rank 10 with 10 games, you are pretty much guaranteed to reach top 3 within 20 games no matter what kind of scrubs you get matched with as long as you keep winning.
Sure, it can be done either way, but in the context of playing around 15 games only, (it's not spamming games), you can't expect to go up to Rank 1 without beating top teams multiple times. (and this is a fact from the match history)
I can't believe I'm wasting time on this, but ok lets look at your match history
vs rank 34 AT
vs rank 34 AT
vs rank 1638 2 man AT with 1 random
vs rank 18 AT
vs rank 3869 2 man AT with 1 random
vs unranked 3 man AT (rank ~1200 )
vs unranked 3 man AT (rank ~200)
vs unranked 3 man AT (rank ~200)
So you beat one decent team in the past 8 games, 5 games were completely free wins and two games (against same opponent) were games you were clearly favored in though opponent atleast had a chance to win.