Yeah, pretty much this tbh. His more recent performances suggest he's been given a bit of extra freedom to roam by Pards and we all know he likes to follow the ball, so at the end of the day it's not of huge importance.
The only time I'd really consider playing him on the left is if we were going 4-4-2. His left foot is brilliant and for 2 good aerial strikers like Papiss and Demba, it's gold dust. The rest of the time, it's all about the right for me, it gives him more options for passing and of course shooting, where he's scored some very good goals and always looks a threat.