Illegal Formations with players in right positions?

[Taurus Land]

Ok, i can agree with you, but the point is: the players are the same ones, one is dc/dl and other is dc/dr. I started with them like dc dc and i'd got 20% , move both to dl and dr and the ball possession jump to 56 %.

In real soccer if we won 36 % ball possession by moving the place of 2 defensive players, i think Mourinho would play the games only
using defensive players and one striker.

By the way, if we have marking style and we can use zonal marking, why we have illegal formations?