Now that he's holding Anakin's Saber it's got me wondering if he isn't a Stromtrooper who leaves the 1st order.... what if he's doing EXACTLY what Luke did... and used Stormtrooper armor to rescue Leia Organa Solo? And that's how he gets the Lightsaber? I mean dude.. we all kinda assumed he was a Stormie first.... but maybe he is never a stormie?! Maybe he's just pretending? Just like Luke!
I bet you Luke gives him R-2. Watch.