It makes sense if you're shooting at goal. If you're not, then you want your playmaker to find space wherever he can. Hence the DLPM who doesn't score much plays deep, where there is likely to be more space, and central, where he can play to either flank. Except Trent can play to the opposite flank from RB as easily as if he were playing in the middle. There isn't much that Trent has shown he can do elsewhere that he can't do from where he is now.