I consider Mirajane being stronger than Lucy simply for the fact that she has shown that she can deal enough damage to take down a Spriggan, and Lucy hasn't shown that. I don't consider Mirajane as strong as your average Spriggan because Jacob had to close his eyes for the duration of the fight. Giving Mirajane the benefit of the doubt, he may have tried using stealth and transport off screen.
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Technically, they do. Hiro likes to make his good guys win, but even bad guys have plot armour. That's why final villains like Acnologia are guaranteed to make it until the final battle with the protagonist. Mirajane is no different, and Jacob closing his eyes is fair point on how the plot allowed Mirajane to win. I don't consider "plot armour" a valid excuse to be used in debates. It's really just another way of saying "I don't like it".Going by your logic EVERYONE in ft has bs plot armor lol.