Barring a trade, I think Rondo-Bradley-Green are set as starters Subjectively, I dislike that trio (although I like each individually), but I would be really interested to know what the stats say about that them together. Although, not interested enough to look it up myself.
It's a big frustrating fact, but covering all of the last two seasons, that trio has only managed to play on the floor together at the same time for just 303 minutes. And most of that time, one or more of them has either been playing hobbled or recovering from injury. Green coming back from heart surgery and missing a year. Bradley coming back from double-shoulder surgery. Rondo coming back from knee surgery.
Overall, during that span (which obviously includes a wide variety of front court pairs, though Bass, Sully & Hump have been the most frequent teammates) they've played generally on the positive side, with a NetRtg of +3.2 points per 100 possessions.
Interestingly, Rondo splits USG between Bradley and Green almost perfectly evenly, with Avery getting a 22.0% USG% and Green getting 22.9%. And all three have shot fairly efficiently, Avery taking 130 shots at an eFG of 47.3% and Green taking 129 shots at an eFG of exactly the same 47.3%! Rondo only took 91 shots during that, but posted a healthy 50%.
Overall, the team's ORtg was 106.4 points per 100 possessions with those three, so that's pretty solid.
Defensively, it has been more mediocre, at 103.2. However, given the bulk of those minutes have been with a distinct lack of height in the front-court (Bass/Sully/Hump), I suspect some of the blame belongs on the infamous 'lack of rim protection'.
In fact, the stats on opponent shot-types are pretty telling. Whereas the total % share of opponent shots taken 'at rim' is modes, at just 29.5%, the conversion efficiency on those is on the high side. In particular, the layup share is only 23.4%, but the conversion of those layups was 61.3%. If I restrict the sample to just this year (removing the small 'KG effect') that layup conversion rate climbed to 63.9%. (Also note, that even without KG, the share of layups didn't really change - just the conversion rate).
So, opponents weren't necessarily getting more of their shots inside against units with the RR+AB+JG, but when they got inside, they were converting at a high rate this year. So that's really on Bass/Hump/Sully. Olynyk also was partly to blame, but he only played 41 minutes with that perimeter trio.
Hmm.... side note - I just noticed that Tyler Zeller had very good rim protection numbers last year with Cleveland. While he was on the floor for Cleveland last year, opponents only took 24.5% of their shots 'at rim', including just 18.2% as layups which were only converted at a 58.1% rate. That's really good. Now, Cleveland was very good at rim defense overall as a team, but without Zeller, they allowed 26.9% of opponent shots 'at rim' and their layup numbers rose to 20.2% & 60.3%. So Zeller was definitely a plus defensive factor for them.
That bodes well.