“And once again, into battle!”

No, it shouldn't be too simple, otherwise it won't be interesting.
We could play as the opponent's faction in the next round, then the tournament theme could be called: "Sometimes tempo, sometimes power." I am strongly against giving weaker players an advantage, because to defeat a strong player, you don't need an advantage, but skill. Maps in online games are generated randomly each time; these are just ideas for offline games. I haven't played RTA and don't want to. And killing an opponent within a certain time or surviving for a certain time is exactly what I was talking about when I came up with the theme; there, a rusher gets a point for rushing, and a leater gets a point for winning in the late game (it can also be done without points). Playing with four people is difficult and takes a long time; it's not always easy to find people who can coordinate their time for regular games.
I like the current tournament format, and I don't think it's a good idea to mix it up with RTA or offline features just for the sake of it.