He became more effective once Gomes was replaced. He started to find more pockets of space with the knowledge the ball would actually reach him, rather than suffering what most of our players suffered from all game, which is the fear of finding space, cause it means you have to get back to mark the player your trying to lose when the ball inevitable gets turned over. Unfortunately, the tone was set when Mina had given the ball away twice in 30 seconds at the start.
Its also why we are so easily caught by a press, we rarely find space. Once DvdB came on, it changed for us as we trusted him more with the ball. Alli will be a beneficiary of that.