Canon(ity) xD

[Future Gohan]

Alright, to avoid confusion, please sum up what your character has truly done so far...

Future Gohan

-Arriving on Earth in a Time Machine
-Beating the crap out of Trunks
-Regaining human consciousness in the middle of a forest

Indeed, he has not entered the saga battlefield.

[Broly]

- Arrives on Earth in Cooler's Spaceship
-Attacks Piccolo and Luna

[Vegeta]

- Just come out of nowhere near Piccolo
- Tried to attack Broly