Yes, otherwise it’s not realistic. In every marriage/real-life romance, there’s always a mortal enemy waiting for every young couple ready to take it down, whether another person or something else like an addiction. A romance is a battle, so it might as well have some explosions and fight scenes.
It's a cover. I'll confirm that Lecrae's version is the original. It's also a common thing in music, and it's okay if you get permission from the original artist. For example, here is a cover that DCTalk did:
This is an awesome cover, and an awesome song. It was originally by The Art Reynolds Singers, though, and if covers didn't exist, it wouldn't exist. (Nobody knows who the Art Reynolds Singers are, though. Unless you do.)