if Rondo hurt his team, it would had been unintentionally because he got fired up. He's not out there pouting and crying and checking out on teammates. These two dudes are completely different.
Rondo did his share of "checking out". I mean, he admitted to not playing defense for an entire season. How is that not "checking out on teammates"? He allegedly marginalized Ray in the offense. He was outwardly insubordinate (refusing to report to the Kings game to go to his birthday party). He clashed with Doc.
Does that mean I wouldn't want Rondo on my team? Nope, I liked him a lot. He's got fire, and with the proper supporting cast, he's going to thrive. However, I don't see him at all differently than DeMarcus Cousins, except that Cousins has been more consistently excellent recently on both sides of the ball.
There are divas, and then there are guys who just legitimately hate losing. I think that Rondo and Cousins fit a bit into the first category, but mostly into the second.