I think he means this:

------------ST-------------
---------------------------
------MC---MC---MC-------
-DML------DMC-------DMR-
-------DC--DC---DC-------

This formation is almost pure defense. I dont think there are many others out there without being illegal formations.

3-6-1 or 5-4-1, they are both hard to break down regardless of which formation you choose.


------------ST-------------
---------------------------
------MC---MC---MC-------
-----------DMC------------
-DL----DC--DC---DC-----DL


Of course, you have to pick the right tool for the job. You dont use a hammer to tighten a screw, so your orders have to be correct to justify your decision. I think the opponents formation and the desired result are key to the decision. So you have to iron out a few variables before you go with a formation.