There was definitely end product, just because he didn't score doesn't mean there was no end product. For a start, his complete domination of OViedo meant that Koeman moved their best defensive midfielder over to double up on him which created the room for silva to run the game and put in the performance he did.
Later, Koeman actually moved Bolassie into the centre because he wasn't providing enough cover against Sané.
So there was end product - not goals, but he forced the opposition manager into completely reorganising his team and created the platform for the MOTM to play well. That's very much end product for his work on the right wing.
He also put in a fair few crosses which should have been goals - beat the keeper and defenders and our forwards just couldn't supply the finish.