Audience’s Attention in the Movies
Be aware that at least 75% of the audience’s attention during a movie lies on the images. As a consequence, writing too subtle (e.g. bringing a hint of the main theme in an accompanying figure etc) when it needs to have a dramatic effect (you need your audience to be aware that this is the main theme) might be a problem.
It is great to “hide” musical gimmicks for anybody who wants to listen to the music seperated from the movie but as long as you need to have an effect in the movie, you should rather be more on the nose in order to reach your audience and create the desired effect.