I think the tournament formula is either not well thought out or simply unsuccessful.

As a result, two unbalanced scenarios emerged for the two rounds.
In both, the outcome was practically predetermined from the start.
And it essentially came down to how the player who was clearly going to lose could prolong the game compared to the first game.
As a result, neither the first nor the second pair, in my opinion, derived any enjoyment from the game.
At least, I can say for myself that this is 100% true.
Everything was decided not in the game itself, but rather around it. In my opinion.

P.S. If this formula is to be refined,
then I believe
that the reverse pair should be played by the same players as in the first round.
Even if the map is partially or completely revealed.
I think this would increase the chances for the weaker side.
It wouldn't force them to go into a clearly disadvantageous direction.
Starting heroes are certainly important, but the overall situation is ten times more important. Because you can almost always find a hero with a similar setup.
I don't think there are any overwhelmingly overpowered heroes that immediately decide the game just because they exist.