As far as who is back on the offense next year, I don't really care all that much who they bring back as far as backups go. The only guys that should really be considered to potentially start next season IMO are Allen, Dawkins, Mills, Zay (and only as a #3 guy at best IMO), and maybe Clay. I think cutting Clay in the offseason is basically a wash contract wise, so I could go either way with him. He isn't a bad player but he's not worth the money Buffalo is paying him given how little he's utilized/how often he's banged up.
Given how cheap Ducasse is, I wouldn't mind him coming back as a depth piece even though he isn't good.
In an ideal world (in my opinion), by the end of the offseason, Buffalo should have 3 new WRs, 2 new RBs, and 3 new starting offensive linemen. That's a ton of turnover though but this collection of non-talent probably deserves that kind of turnover.
Some of the guys I've been eyeing so far as potential targets are:
WR:
John Brown - FA
Quincy Enunwa - FA
Jermaine Kearse - FA
Adam Humphries - FA
Tyrell Williams - FA
N'Keal Harry - Draft
Collin Johnson - Draft
Kelvin Harmon - Draft
Riley Ridley - Draft
Tyre Brady - Draft
RB:
Le'Veon Bell - FA
Corey Grant - FA
Tevin Coleman - FA
TJ Yeldon - FA
Damien Harris - Draft
Karan Higdon - Draft
Darrell Henderson - Draft
Matt Colburn - Draft
Obviously we're still a long, long ways out, but if I had to guess right now, I'd say that Adam Humphries, Tyrell Williams, and Damien Harris are Buffalo Bills next season, and I pray that they also draft a WR early too.