@ImDictatorBowDown: I find it funny how you're the first person I've seen to ever question him transforming the first time. I also find it funny how you literally have no proof to claim otherwise. Why does the movie need to state he was restrained or not when the proof is right there? How the transformation itself occurred is proof or they would have felt that same energy back then.
Broly obviously needed a push or to gain a certain amount of rage to do it. And how can you question me with only claims? At least put an effort to prove to me he was LSSJ when he did it or became it sometime before. Because everyone else here agrees he was RSSJ.
Another point is, how would have Paragus controlled him when he became a LSSJ? Because when he was a RSSJ and powering up with rage against Goku, he no longer had control and the device broke showing that's the first time or he would obviously have been prepared for that transformation. Point is he had a hard time controlling SSJ Broly and he can't hope to stop LSSJ.
Just face the facts the proof is there.