The Bills will always be super bowl contenders as long as Josh Allen is their QB and he is not injured (Touch wood!!!)
The team is still loaded on offense even with the loss of Diggs and Davis. James Cook was the 3rd or 4th best RB last season in the NFL and will only get better as he continues to correct his mental errors. Dalton Kincaid came on very strong in the 2nd half of the season and can continuously move the chains. The same goes for Shakir. He made clutch catches in the 2nd half of the season and was better than Diggs and Davis in the limited opportunities, We still have Knox who can make those big catches on the sidelines when the game is on the line. Adding a speedy boundary receiver on the perimeter will help take the sting out of the Diggs loss. Not to forget the signing of Curtis Samuel.
Hyde and Poyer were slow and on the downside of their career. They could not make the difference in the Playoffs and we need to find out what the young guys can do. If Milano can come back from his gruesome injury successfully, then he and Bernard should form a good LB core that can make the 3rd down defensive stops that we sorely lacked in the playoffs. With Cornerbacks, again it is not that we have lost superstars. They are all replacebale via the draft or the 2nd and 3rd wave of FA.
The biggest weakness of this team is its coaching staff. They have not been able to out-coach the GOOD teams in the playoffs. That is due to the conservativeness of McDermott. He has to change that to be successful in the playoffs. The chiefs are winning because they have Andy Reid as their OC and a fiery Steve Spagnola as their DC. Steve has had much lesser experienced talent than the Bills to work with and he has successfully molded that defense. The Chiefs won this SB not because of Mahomes (who does Mahomes things) but due to that outstanding defensive effort.
Go Bills !!!!