Only if Kevin Petersen is a game-day active.
Other than that, there is no real reason to bring him up to the 53.
If Peterson is not a game day active Webster might have a more serious injury than we think.
I was uncomfortable with only 3 outer corners myself.So if it were my decision I would dress him. Countess & Joyner may be very good Nickles, Dimes Deep Safeties & even SS's in Wade's"D" but neither should see any amount of action @ outer corner. I have no ideal about John Johnson who is 6-1 205 good size but I do not recall seeing him in pre season @ outside corner do you?
Troy Hill will be available next week(SUP) if Webster is more damaged than originally thought. KW has not had a good start here for the Rams thus far he has been dinged up all TC & pre season now going out in the first quarter of the first gm of the season. Webster ended his 2016 season on the IR. Having a injured shoulder is nothing new to Webster ...A bit concerning ? Not being a starter since arriving in the NFL

& reviewing the injury list for a non starter:eek: ...take gander @ the below info:
2017..wk 2 Shoulder Questionable
2016 ..wk 17 Concussion Injured Reserve
2016..wk 6 Hamstring Questionable
2016..wk 5 Hamstring Out
2015 ..wk 4 Ankle Probable
2015..wk 3 Ankle Doubtful
2014 wk DC Shoulder Probable
2014 wk 17 Shoulder Probable
2014 wk 16 Shoulder Questionable
2014 wk15 Shoulder Questionable
2014 1wk4 Shoulder Out
2014 wk13 Shoulder Out
2014 wk9 Not Injury Related Probable
2014 wk 2 Ankle Probable
2014 wk 1 Ankle Probable
2013 wk SB Thumb Probable
2013 wk CC Thumb Probable
2013 wk DC Thumb Probable
2013 wk 6 Thumb Out
2013 wk 14 Ankle Probable
2013 wk 13 Ankle Probable
2013 1wk 1 Thigh Probable
http://www.foxsports.com/nfl/kayvon-webster-player-injuries