4-2-3-1 or 4-3-3, whatever you want to call it, causes much more trouble for the defence. Against 4-4-2 the two central defenders probably know before the game which striker they are marking.
But in the other system one CB may have the striker but the attacking centre mid can go where he wants, pulling the other centre back to anywhere in the defence. This tends to leave a gaping hole in the defence.
This is precisely the reason why you see most modern football teams have midfielders who tend to score far more goals than they did in years gone by - think of your Iniesta's. your Lampard's, Gerrard's etc.
If you go back to one of Liverpool's glory periods, Dalglish and Rush, you can argue that we were the best side in the world because they did not operate as a traditional 4-4-2. Rush was up top, ala Torres and Dalglish marauded just behind him, like a Gerrard.
Maybe Paisley was the original proponent of the whole system?
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