Only the top 51 salaries count. Unless the Bills are signing some of these guys to more than the 51st salary on the current roster than it wont affect the salary cap at all.
http://www.nepatriotsdraft.com/2016-nfl-undrafted-free-agents
Follow there for up to date UDFA's:
As pointed out Davonte Allen a WR from Marshall is apparently signing with the Bills
Just remember at this time last year people were bitching about Karlos Williams getting taken and he was pretty good when healthy last year. John Williams will make the roster and play special teams and provides protection for McCoy and Karlos Williams
Hmmm, I recall a hell of a lot of posters on this board fighting the hell out of me in the LB thread when I stated that Ragland was a two down thumper in the NFL and wouldn't go where he was projected(mid teens at the time). I stated this over and over again that this type of guy struggles to play in this era of the NFL. That's why guys like Darron Lee(who I was extremely high on) go in the first round because he can play 3 downs while Ragland waits to find himself a new home. I'd venture that Ragland might be available at 49, but I still don't want the Bills to pick him
I happen to think that the Bills want Darron Lee or Leonard Floyd and if they are there the Bills will take them. If those guys are off the board, I think Buffalo wants to trade down and target Chris Jones, Vernon Butler, or Karl Joseph