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Well, we do know Champa matches Beerus in power itself according to the flashback. But power isn't everything. Champa admitted not having trained in decades, while Beerus even while holding back, has been practicing somewhat with the bouts he had with Goku in BoG and with Vegeta recently. Not to mention, we do know Champa has lower stamina and as we have witnessed sagas ago, that makes a lot of difference in a fight.
A person with skill can beat people stronger than him. While a battle of people with roughly the same power can become a match of endurance. Hell, Vegeta VS Black in the manga eventually turned in Vegeta's favor due to that, as while they had roughly the same power, Vegeta could lessen the power drain from Blue with God-Blue. Meanwhile, Goku is mindful of attempting Blue after using Mafuba, as he noted the form's stamina drain, meaning even if he could access its explosive power, he wouldn't be able to sustain it for long.
We have a bunch of God of Destructions, but as we have seen so far, only about 4 of them kept being dilligent through those recent years. Even assuming the 12 gods have about the same power, it's clear this isn't everything and some of them must be out of practice.
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