Hi mate, ^^)
You can train your DM to MC with Ball Winning Midfielder roles and duty. So he can be natural in this MC position.
Yes, I used target man and a lonely striker is target man which ball suppied is run onto ball. For this, Villa is great and suits because he is fast, a good dribbler, finishing, long shot, flair, technique, pace and off the ball. Run onto ball is better to apply for a fast player.
Yes, I have untick the primary playmaker because i only used one playmaker in my tactic which is at central of midfielder. He must be good dribbler, passing, creative, off the ball, first touch and technique. I do not need to tick because when we have put someone as playmaker, it is automatically will choose your primary playmaker. So you did not to choose it by yourself. But, if you have played 2 player as advanced playmaker, the tactic still choose the primary playmaker by itself. So, you need to choose or tick it yourself to choose which one is better to be a primary and the other one will be as secondary. Just want to mension, its good if we have only one playmaker, so his teamate can supplied the ball only to him to generate the attack. (H)
My main playmaker is Gourcuff but since I have bough Silva, I have rotate both. I still keep both to play together which one of them play as playmaker and other one play as box to box. Just rotate them, so my midefielder is so creative.