I think Sadie will be really helpful to Lars in the future. She sees that deep down he has some good in him. Lars cares a lot about his self image when he's around people he admires or he doesn't want to look dumb in front of. But remember in 'Island Adventure', Lars said, "Do you ever get lonely even when you're around people?" I think this speaks to the fact that Sadie doesn't seem to have a lot of friends in Beach City. Sadie seems to be shy, not really liking the spotlight. Lars, on the other hand, has a bit of an ego and wants people to notice him. I think they both have similar insecurities. Neither wants to look foolish in front of others. They just handle their insecurities differently. I think they have a lot more in common than they think, and I think that they can help each other overcome their insecurities and make them both better people.