Morguir

Buddy, did you even read the buu saga? Shin was literally introduced in the Magin boo saga of dragon ball Z which takes place before daima. He was present from the beginning of the arc at the beginning of the world martial arts tournament. Sheen and kibi toll were at that tournament. Kibi toe fought go Hawn. Qin was present for the interaction between goku and majin Vegita at the tournament arena. Shane was the one that suggested go on. Go to the land of the gods to train to fight match. And boo, so I don't think you even read or seen dragon ball, z

So if somebody says that they had just gotten used to being in a new state of being, but they were able to reach a new status or form. He's done it before he just didn't know if it would work while he was tiny. And unused to his body. This is the worst source of information.For any theories around anime, and ninety percent of them don't even take into account the rest of the context of the situation.

Goku may have achieved super sane 4 for the first time in the show. But he said he wasn't sure if eh it would work referring to the form meaning he knew the form existed, and he'd been in the form before problem being.He'd never used it in a fight. I don't think that never actually did much of anything other than restore his energy. Because goma literally fought him to a standstill to the point that he tired out.And collapsed on the ground. Never restoring his energy, and maybe using a little bit of magic with that energy. So that goku could feel magical energy and use it, which is probably a requirement for the super sane 4 form. Considering that it appears to be carrying around a lot of magical energy and the kamihami hahi used was infused with magical energy. So just like with God key. If you're not aware that a power exists, nor are you aware of what it physically feels like you can't use. But once he was made aware of the power that he had access to, that, he wasn't sure if it would work in his tiny form, because he was so small, never basically forced him to his strongest form. You didn't act at all surprised when he was transformed into super San 4. He already knew what it was. And how it helped him, they said that showing the veins growing within his body when never did. It was a cinematic storytelling choice to symbolize the on screen birth of a canonized version of super say. In four never once did go crusa, say that he had never experienced that form and that he didn't know what it was.