from that article

"Neither last year nor this year have they played much aggressive man coverage—it does not work with this scheme. The idea is that teams are not going to be able to consistently have long drives and that it is better to play that way than give up big plays by playing man coverage and giving up chunk play after chunk play".

[nflfootballjournal.blogspot.com]

Me: - way too many long drives this year - cant get off the field.