Benitez's system is built on a target man feeding off crosses, lay offs and commanding CB's who can attack the ball - without DCL and Mina we have neither - throw in Doucoure and Richarlison missing for large parts of the season so far and thats why we are struggling at present.
I would prefer to see a 3 man midfield but at the same time thats not the root of our problems its the barebones squad and its lack of quality thats hurting us.
Thats going to hurt the next manager and the one after that until we get the recruitment right.
Players like Michael Keane, Holgate, Coleman and Digne can not defend well enough in an open system. Its why Ancelotti changed it last season when we started getting cut through like butter after the Southampton away defeat - but that way was never a long term fix and plenty on here including myself moaned that we were going nowhere with that set up.
So we then can't moan when Benitez tries to be more open because the next "progressive" manager everyone is hoping for will surely have to play a more open style!!