From the little I've seen of him Sancho looks like a show pony with very little end product. Yesterday was another example where he got the ball in space, Maatsen all set up in space to receive the ball yet Sancho farts about for ages before eventually passing the ball to Maatsen who no longer had the space and opposition players on him.
I'm not writing him off but the signs are there. As Paulie used to refer to Spurs all those years back, 'all fart, no shit' seems to fit Sancho like a glove.