formations with 3 defenders dont use all DCs?

[adifairus]

talk about 3 defenders,

depending on your opponent, if they use narrow attacking without wingers, only ST and AMC, you can make all your DC play inside DC box

if your opponent use 3 attacker including winger, you can locate 2 of your Defender position right the same with their wingers

if your opponent is stronger than you, don't ever use this one on one defending, you will surely lost