I'll be discussing about Movie 10 Hax and it's continuity with Movie 8.
Movie 8:
King Kai: Broly maybe stronger than "you guys". If you go by manga power chain, this quote can be comprehended like this -
Power Chain:
MSSJ Gohan > MSSJ Goku > USSJ Vegeta > USSJ Trunks > Piccolo
But here...