Buffalo Bills quarterback Josh Allen has been one of the best players in the league over the past few years. However, Allen has never won, let alone made a Super Bowl in his career.However, NFL analyst Mina Kimes does not believe Josh Allen is at fault for the Bills' playoff disappointments over the past few seasons. Instead, Kimes thinks the Bills' receivers have held Allen and Buffalo back."He [Josh Allen] was second in QBR versus zone coverage, ninth versus man [coverage]," Kimes said on 'NFL Live.' "That's not a Josh Allen stat. That's a Bills receiver stat... When you are talking about an offense in Buffalo that faces a ton of man coverage because defenses now are so afraid of their run game, it honestly is the kind of thing that is the difference between them winning, or making it to a Super Bowl."Kimes then highlighted what needs to happen in Buffalo for the Bills to take the next step."You need one of those skill players to step up as a true one-on-one man [coverage] beater. Someone who can get you big plays downfield. Maybe it's Keon Coleman, maybe it's Dalton Kincaid. To me, that has been the missing piece in this offense because it's not the quarterback that is the reason they're not getting over the hump," Kimes said.Who is at fault for the Bills' postseason struggles?It is hard to argue with Kimes' comments. In 13 playoff games, Allen is averaging 258.4 passing yards, with 25 passing touchdowns and only four interceptions. Furthermore, he has 668 rushing yards and seven rushing touchdowns during that span.As a result, a lot of the blame appears to be on the receiving core and the defensive unit in Buffalo. Although Stefon Diggs was one of the best receivers in football while in Buffalo, he was consistently shut down in big games, leading to an inability to move the ball down the field.In the AFC Championship game this past season, Mack Hollins was the only Bills pass catcher to eclipse 50 receiving yards. Although Khalil Shakir is the clear WR1 on the offense, he only had 46 receiving yards in the big game.Although defensive improvements also need to occur in Buffalo to ensure that every game is not a shootout, the Bills need their receivers to step up in order to finally take that next step and reach the Super Bowl.