And why would anyone think trunks is stronger than vegito? Because he was able to fight on pair with zamasu? Did you guy watch it without subs or did you perhaps not get what was happening? Zamasu kept losing it, which made him weaker (its been like this ever since DBZ. lose it and you will be weaker. remember vegeta yelling at nappa to keep his cool?) heck, even his body changend. and hello? vegito was toying with zamasu. thats his nature. vegito thought he had a full hour to play with zamasu, but turns out he doesnt just like SSJ4 Gogeta didnt.