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Here's my thoughts on the whole Trunks scaling issue I've seen in this community.
>The GT Trunks is too short compared to Z Trunks.
Yes he is, but his scaling to GT Goku and Pan is really good.
Z Trunks looks consistent to the Z anime scaling.
GT Trunks is kinda consistent with GT's scaling.
Z anime isn't consistent to GT's scaling, because they are both pretty different to each other art style wise.
Going through Kai, GT, and the manga. I'm seeing a lot of wonky hights in the manga, the Z anime is more consistent with itself depending on Saga throughout, but comparing Cell Saga to GT is very noticeable. Body proportions are very different, ans some characters look skinnier, shorter with bigger heads including Trunks. GT tried going back to the Z-ish art style with SS4 Goku and Vegeta.
I do prefer if GT Trunks was the same hight as Z Trunks, but I do keep in mind the sculptures are trying to be accurate to the depictions of the source material, while the source material doesn't really try to be consistent with scaling through out the decades.
After just watching, and making comparisons. I'm more convinced SS4 Goku is the same height as regular adult Goku. He looks bigger because everyone around him shrunk in GT.