Good point about most people wanting peace. I suppose it would be more accurate to say that he's a loner and wants to keep to himself.
I've just started brainstorming this idea, and haven't nailed down all the details, yet. I haven't filled in all the beats on the beat sheet, just the beginning, middle, and end, plus Theme Stated.
I listened to the latest episode of ScriptNotes Podcast the other day, where Craig Mazin goes over his views on screenplay structure, using Finding Nemo as an example. Basically, I'm onboard with the MPR bit.
One thing I didn't include in the logline, to keep it short(er), was that an old friend, another veteran, turns up early on and is the one who tells the protagonist about the pirate and the ultimatum. I'm thinking the Midpoint Reversal is that the protagonist finds the artifact but the old "Friend" comes along and takes it from him because he set it all up so that the protagonist would lead him to it.? The Protagonist then has to defeat the pirate and the "friend" who's working with the pirate. It was also because the "friend" was so unreliable that the Protagonist wanted to keep to himself?in the first place.