Recent report said that there are offers out there for Rondo but the Celtics don't think they're good enough. I'm pretty sure that the report was based around the Sacramento idea and basically said that #8 + Mclemore wasn't enough in Danny's eyes.
Maybe #8, 2015 Sac first round pick unprotected+Mclemore, but Danny is too confident that he'll be able to re-sign Rondo.
Also, it fine if you're going to give Rondo a hard time about his stats this season, but it's probably best to give him a full offseason to work out and get back into shape. Same with Sullinger- he hasn't had an offseason to try and drop weight and lift hard in the gym.
It's fine to be the judge, jury and executioner, as long as you give the defendant a fair trial. half a season on a purpose built tank train with a rookie coach, whilst coming off major injury, is probably not a fair trial.