That's not entirely a rule. Some QB's come in as rookies and make the playoffs, others in more recent memory have taken HUGE strides forward in their second season (Mahomes, Trubisky) - and teams make the playoffs because they have a strong defense, good coaches (who manage their clock and challenges well) and breaks in the schedule along the way. Look at the number of games that the Bills have played in past seasons that came down to a SINGLE play (a missed FG, a dropped pick 6, a hail mary that someone came down with, a bad call by the officials). This is probably a playoff roster - now we need to execute McBeane's plan.