HUEBR_Tapion said:
@Spiral-Force i think that what confirms Goku was really there is the fact his Kamehameha fused with Gohan and Goten's in that last beam struggle. If he wasn't there, then it would have looked the same as before imo.
Perhaps hearing and seeing Goku was enough to further power up their blasts, twice. Also, the time gap between Goten's cry for help and Goku appearing was roughly 9 seconds. It seems far-fetched for Shenron to address Goten
that quickly. And the question of "how did Shenron hear Goten?" arises, as Goten was speaking in his head.
Furthermore, Goku's second question below further reinforces that he wasn't
really there with them:
DBZ Movie 10
Time: 46:51
Context: Goku asks rhetorical questions
Goku: "It is fine with you guys if the Earth is smashed to pieces by Broly?! Can't you protect it if I ain't around?!"