No Jacob was defeated by Makarov and Natsu
Without Lucy, Makarov and the rest of FT would not have returned from the Dimension that Jacob sent them and they would have died, even if Natsu had defeated him he would not have returned to the others.
It was Lucy who moved the Plan to save them, without it they would really have lost.
In addition, it is notorious that some want to downgrade the importance of Lucy in the final part, saying that it was Meredy who connected them all, but forget that without Lucy no one would have ever thought of using the Fairy Sphere (nor would they have agreed to it) and I do not think many would have followed Meredy as if they did with Lucy.
Gentlemen, I am referring to an old Mexican saying, "Para gustos los colores" which means "For Tastes the colors" which means that we all may like something more or less and it is not bad, everyone is entitled to choose, because we do not have the same tastes, the joke is to respect the tastes of others without trying to lower them.
Lucy is a great protagonist, that the character had Ecchi ?, Well, what's wrong ?, Does being sexy down the ability of someone? That is discriminatory, she was not all powerful and that helped her, because she showed enormous growth and great value, because it is easy to be brave if you have all the power or great destructive capacity, but it is more praiseworthy to be able to do it without having all that, overcoming limits and weakness, that's what makes it great.
Idem, I think the issue is to respect the tastes of others.
Well, we'll have to wait to see the first chapter to see how the prota will be, what if I really look forward to seeing what it will be like, hopefully we'll see fun aspects and the occasional Cameo of Mashima's works.