So the Oilers are in a bit of a pickle. They signed goalie Anton Forsberg to be their #3 goalie this offseason behind Koskinen and Smith. Instead of keeping Forsberg on their main roster like the Leafs did with Dell they waived him at the end of camp and he was claimed by Carolina (Carolina re-waived him yesterday and he was plucked up by Winnipeg before Edmonton could grab him again). Unlike the Leafs though, it wouldn't have really been a big deal for the Oilers to keep Forsberg on their roster. They currently have 13 forward and 8 defenceman up, so there was roster and cap space available.
Now Smith is "unfit to play" and is expected to miss multiple weeks so the Oilers are turning to 22-year old Stuart Skinner to be their back-up. Skinner had a 0.892 Sv% in 41 games in the AHL last season.