Nobody plays 2 authentic strikers(such as Drogba,Torres)
nowadays.
Actually "paper formations" are just that. Tactics are so fluid
nowadays that managers just come up with a "paper formation" to
satisfy the media's queries.
A 4-5-1 looks defensive on paper,but actually it can easily
morph into 4-2-3-1 on the field.
As for 4-6-0,Man U, Roma have played it to some extent from time
to time.
