This.The system we played was interesting with Dembele in mind.
Pretty much all the time he has played as one of the two in a 4-2-3-1, with Dier. I think it didn't suit him or us where he was in the 4 ahead of Wanyama. Also his understanding with Wanyama isn't so good and was often facing the wrong way which hindered our progressive play. It was not until the second half until he moved back and we had more control of the game. Bournemouth tiring also helped. Of course, it is good he got 90mins under his belt, but I would like to see him not in AM, as he is not as effective there.
If Dembele is going to play, I think it has to be in a 4-2-3-1. It may pan out to be a choice between Dier-Dembele and Wanyama + another AM, depending on opposition.
We certainly didn't get the best out of him today.