In the DB wiki they say you need to be at least 2x stronger to stomp which is what happened in this case, and there's gohan losing to cell in half power but in full power he over powers him completely and wins. And sometimes it's even more than 2x like kaioken 10x goku doesn't one shot hit completely. And don't forget that goku stomped jiren who's already way above half low 2-C, half low 2-C < Beerus < belmod < Jiren <<< MUI goku. And don't give me that, not enough proof for multiplier shit, the context of the show shows that these power gaps are very big, there is proof for 2x multiplier for ui goku blue gogeta and hidden power jiren and they still only get "likely" like the angels, in the case of full power jiren and sign 3 goku, there isn't as much proof only the big gaps with the scaling chain, so I propose "possibly 2-C"