Unfortunately it looks like Mitch is on his way out but I highly doubt Sims ever gets on his level. Best case scenario for Sims is sticking around in the league and playing backup to Noel.
For all his athleticism Sims is still just 6'9. A center in power forward's body
Since I don't follow college ball I don't know how good or bad 1 block a game is, but Mitch gets 2 a game in the NBA with ease and affects so many shots.
Last season Mitch put some weight on and didn't get bullied around by other centers, other than his usual dumb fouls Mitch was putting it together last season.