+Res/-Def Halloween Jakob issue

It took me roughly 200 or more orbs to get two Jakob's, both of which have bad iv's.
I don't know how to use him, however I have a mixed team with Zephiel, Legendary Lyn and performing Shigure that would like a neutral coloured unit.
I have def tactic and speed tactic as my main buff, but not sure what skills to put on him.