I literally said that Jura is probably 10x Cana lol.so you are saying that Cana is stronger than Jura/Laxus without FG?
What I am saying is that Fairy Glitter has high base damage. And Cana wasn't tired at all after using FG in GMG, that combined with Makarov's doubts suggest that Mavis played a role here.
When she used FG in Alverez, she was getting tired.