The NFL operated in a two-conference system from 1933 to 1966 , where the champions of each conference would meet in the NFL Championship Game . If two teams tied for the conference lead, they would meet in a one-game playoff to determine the conference champion. In 1967 , the NFL expanded from 15 teams to 16 teams. Instead of just evening out the conferences by adding the expansion New Orleans Saints to the seven-member Western Conference, the NFL realigned the conferences and split each into two four-team divisions. The four division champions would meet in the NFL playoffs , a two-round playoff.  The NFL also operated the Playoff Bowl (officially the Bert Bell Benefit Bowl) from 1960 to 1969. Effectively a third-place game , pitting the two conference runners-up against each other, the league considers Playoff Bowls to have been exhibitions rather than playoff games. The league discontinued the Playoff Bowl in 1970 due to its perception as a game for losers. 
Yes Decker was good in Denver, and yes he has rebounded this year after a tough first year in the Big Apple, put there are three reasons why the sixth-year player out of Minnesota played so well in the past as well as currently. Those reasons are Demaryius Thomas, Peyton Manning, and Brandon Marshall. Catching passes from a sure-fire Hall of Fame QB will in almost every single case, result in better numbers, as will the presence of an elite WR lining up across from you as Decker had in Denver with Thomas and now with Marshall in New York. You would expect more from a player who just singed a five-year $ million deal last year.