Smart coming back will be a big help. To me, that is obvious. In addition to allowing us to stretch our depth, he will also make a big difference when we have to rest Kemba Walker.
As to Romeo Langford, hard to know what we are going to get from him when he does come back. If we get the guy from the end of last season and in the playoffs, great, he will step in and help the bench in a meaningful way. But this has been a long layoff for a player who had barely established himself last season. I am afraid he is going to have fallen behind due to the layoff and that it will be hard for him to catch up mid season under the circumstances.