IMHO, don't agree. He is capable of those moments against top opposition irrespective of how things are going.
In terms of how to see more benefit from him, you play him further up and actually have the ball cross midfield. Ideally, you want him playing right off the box so you can take advantage of his crossing, shooting and ability to draw fouls. As long as the team is advancing the ball with moderate volume of play he will create damage and just off dead balls is a threat alone.
If you have Iwobi or anyone with pace with him in midfield, then he came come back and generate the play, but someone needs to run or it's going to stall out.
What you don't want is to dedicate Gylfi AND Gomes to playing as Modric style deep lying 10s in the first line of midfield AND STILL need James to drop deep to get the ball into the opposing half at all (as happened today in the first half), because then you are reliant on a sheer moment of genius or a defensive error...