Wait, but there could easily be stronger fighters than Goku in U7.
The only reason we've never seen them is because Whiss left the job of finding strong fighters for the ToP up to Goku and he chose those he was familiar with.
He left Uub, despite him being stronger than 1/2 of the team.
He never scouted the universe for high power levels and he believed that Monaka was strong, because Beerus told him so.
This means that we can easily get another villain from a planet even Frieza would be scared to screw around with. A planet filled with mortals who wanted to stay off Beerus' radar and/or were plotting to overthrow the GoD's and Zeno from the start and decided to keep their planet hidden like Wonder Woman's Island.
A planet(s) filled with magic users who can create barriers to shield the fighters with their enormous power levels.
At least 5 of the 28 planets can be like this. Frieza wasn't the emperor of the universe at all.
For starters, he wasn't the emperor of Namek even though Namek was canon fodder.
We could have more rivaling empires and planets.
Similar to how Earth has had several empires coexisting and warring with each other.
Hell, Frieza could then be the laughing stock of them all because his empire is on the brink of extinction and because he was defeated by mere monkeys.
They could mock him, because Frieza believed that he was born with the right to rule and felt no need to train because of his natural strength but was forced to after he had his ass handed to him, while the other empires did nothing but value training.
Cold knew about Beerus (the other emperors as well) but we've all seen that Cold was a conniving coward.
Easily the weakest of them all and it would explain why Frieza is so "evil", it's because of shame.
And his obsession with the Saiyans was simply his way of having fun, to distract from the reality that he's worthless compared to the rest and he would kill everybody to keep this a secret.
Enter: Dragon Ball Next!