Of course, right now, it is a very small sample size, but I think its beginning to be fair to question how much point guard James is going to play this year. Barnes seems to want the ball in the hands of Turner, at this point.
So, Vescovi could become the backup to LT and still not pass JJJ in the actual rotation because it appears as though James is playing almost exclusively off the ball as a 3rd guard. Vescovi's presence could simply be an effort to not have to play Turner for 39 minutes/gm at the point.