I would imagine he sees some time. Maybe a couple early targets before Allen gets pulled. Having been off for so long I'm sure they want to see where he is at. I suspect the Beasley injury may be slightly more serious than they are letting on, otherwise I don't see why they would even bother with Stills. I have a hard time seeing the Bills winning this week. No way they will play Allen/Diggs/ Milano/Edmunds/Tre & maybe even Poyer more than a quarter.
Something to consider here...
Beasley out, Diggs likely plays a couple series then is done. That leaves you with John Brown returning from injury presumably on a snap count. Gabe Davis, McKenzie, & Andre Roberts. Andre Roberts is the key return man and a huge part of Bill's success. No way they want him out there getting targeted like crazy. Gabe & McK both play parts in the offense, they want to protect them too. Barkley will be in the game likely before the half, presumably handing off to Taiwan Jones a bunch. Maybe they will dial up a couple passes but they'll be high percentage to tight ends like Lee Smith.
I would play very close attention to who is activated for Buffalo, as I think it could be a good indicator of what the game plan will be. If Kroft/Gilliam are activated you know the offense will be all Taiwan Jones and bleeding the clock. If Trent Murphy is active they will be sitting a d lineman early, and if a LB & Poyer get pulled out Miami will be able to run ALL over the Bills. Poyer came back in last week after being checked for a concussion. His style is Very physical and they may decide to keep him from banging with rbs this week.
McDermott has talked about giving people who have earned a right to see playing time live action. It just so happens that the circumstances may dictate that he goes uber conservative and gets to the playoffs in tact. JMO it's tough though because of all things they have going for them momentum is a big one, provided you believe in that sort of thing.