mixed roles??????????

[blatchford85]

i play a 4-2-3-1 with my midfield 3 to wingers and a attacking midfilder my best to fowards play best as a trequartista so i was thinking wont my att mid and forward then be doing the same job att mid get foward into the hole and run into the box and smash some goals in and my foward role means he drops deep to get the ball wont they both be doing the same job or get in each others way ????????