Well Nani has been making goals in recent games without us having a clear tactic of trying to find him as much as possible on the left and building our play towards that goal, like it could be suggested we did with him against City and Arsenal when he was on the right. Or the way we do it week after week with Valencia on the right.
Perhaps if we changed our style and did have a clear focus on "get the ball to Nani on the left" he might have wasted the ball more often than he did today and take the shine off his overall performance. On the other side of the coin he may have had more quality deliveries into the box and we could have scored more goals. Simple fact is we
dont know what would happen if we looked to play through him on the left as much as we usually look to play through the player on the right. Could have been beneficial, could have been detrimental, so I'm not suggesting we should change whats currently happening when we're doing pretty well with what we're doing already. I just wanted to highlight what I've seen with happening this season with Nani on the left as opposed to Valencia on the right.
I think there's just more trust in Valencia making the right choices going forward so he's seen as our main choice to work the ball to. And of course when Nani is playing on the right, Valencia isnt playing, so Nani immediately receives that role off him and so he receives the ball more often when open and in space on that side.