It isn't an issue of whether Rondo is a quality player.
It's an issue that he no longer fits with the group of players Ainge has assembled. That is quite clear, and it has been for awhile. As I've said before, he was a perfect fit with three veteran, slowing All-Star scorers.
He is not a fit at all - in fact, he is an impediment - with the group Ainge has assembled right now, led by two veterans who struggle to score every night.
Exacerbated by Rondo's growing laziness on the defensive end of the floor.
Confident Ainge will move him in the off-season. As he should.
I think Coach Bo is right in general. I see the "problem" (if you want to call it that) with Rondo is that other teams have now universally figured him out and this will make it very difficult for him to change and just adopt the move the ball mentality that the current team is playing so well with.
This is a nuanced situation and hard to describe in a concise post. Rondo is a good passer, no doubt, perhaps the best pure passer in the league, but he can't shoot (I know, he has a high EFg% but if you watch the games and come to the conclusion that Rondo is a good shooter, then just don't read any more of my post because you are not going to agree or understand any of it).
The problem is that Doc/Rondo can't figure out what to do with Rondo when he doesn't have the ball. The other team doesn't cover him so it is like giving them another defender. For a while they tried having him camp out at the extreme low post (almost under the basket) but that didn't really work. So it always comes back to you might as well just let Rondo have the ball. Then he dribbles around, compiles a ton of assists, and no one really likes playing with him (at least that is the story according to Doc). Along the way, Rondo does make some fantastic plays but actually the team averages more assists when Rondo doesn't play. For every easy dunk off a flashy pass, there is a shot against a double team because the other team isn't covering Rondo.
And defense, yes, our defense appears better without Rondo. He seems to like to rebound, they count those, but he doesn't seem to care about just staying in front of him man and fighting through picks (there isn't a stat for that). I know, I know, in the playoffs, he will be different.
Rondo is a player with unique skills but also some glaring weaknesses. If we keep Rondo, we need to figure out a way to use him that doesn't kind of clog up the team. Depending on what we get back, a trade may not be such a bad thing for the team either.