It will be interesting to see if they can get veteran WRs & TEs that are either nearing the end (Gronk or DJax) or coming off an injury riddled season and is only getting Show Me offers (JJSS) on value deals to add weapons on offense.
With Sanders and McKenzie hitting FA and the questions about bringing Beasley back at his cap number, Beane might be able to leverage the opportunity to play with Allen into below market contracts for guys that can improve the offense.
https://www.spotrac.com/nfl/buffalo-bills/cap/
The cap situation isn't great. They are in the bottom third of league in cap space entering the off season. Beane and company will need to make decisions on guys like Edmunds (1 yr guaranteed at $12.7M), Beasley ($7.5M cap hit vs $1.5M in dead cap if cut), Morse ($11.25M cap hit vs $3.75M in dead cap if cut), and others.
It will be interesting to see what moves they make to create more cap space to try and improve this team.