The reason why Mothra doesn't need to use her muscle form:

I would like to thank those who didn't vote but instead replied that I'm not stupid :) And as for the other 379 people who voted... https://t.co/yNIxiGYrmF

Did I ever mention that Heisei Godzilla was my favourite Godzilla? Tbh, I still love the Heisei era, especially Little/Junior Godzilla. I really enjoyed their father and son relationship, it was really heartwarming (and sad...) #Godzilla #ゴジラ

Father and son bonding time! All is going swell... but Godzilla just had to share his forbidden memory... (More below (1/2)) #Godzilla #ゴジラ

Junior now has nightmares about it... poor boy... (2/2) (Obviously, it's a joke, Heisei G is handsome and way cooler than Minilla)