One of the things that has been most apparent over these first three games is that Amir really needs to be upgraded. He looks slower than ever this year, and he is averaging his lowest minutes per game since 2010, lowest points and rebounds per game since 2009, and his lowest fg% of his career. At this point, he is a major negative offensively, as exampled by defenders giving him wide open midrange shots, and his loss of his athleticism has really downgraded him defensively.
Ultimately, we should hope that KO will eventually win the starting spot once he returns, but as for now, why not include JJ in the starting lineup instead of Amir? At this point in their careers, I think JJ is the better overall player for us due to his versatility and better two-way play, and even Amir's advantage in rebounding is negligible when you look at their career histories. And though he is listed as our center, Horford has essentially been our power forward all this year, because he regularly guards the power forward of the other team (Williams in Charlotte, Gibson in Chicago, Booker in Brooklyn) with Amir guarding the center. I think this is largely because Amir doesn't have the speed or mobility anymore to guard the stretch 4's out on the perimeter, so he is relegated to guarding the centers.
However, if we start JJ next to Horford, then this opens things up for everybody. Offensively, not only does it include another shooter in the mix, it also creates more overall spacing for penetrating the lane. Amir creates absolutely zero spacing for penetration, and it's to the point where defenders are even daring him to take midrange jumpers due to his shot being so bad. JJ, on the other hand, is an elite three point shooting big from the 4 position who has shot better than 40% from three point range in his tenure as a Celtic. Further, this allows Horford much more room to post-up in the lane, where he can run the offense effectively by either putting it up himself or waiting for the defense to collapse and kicking it out. It would also aid his offensive rebounding, which is by far his worst year in that category in his career due to being out on the perimeter so much.
Defensively, this would allow Horford to be closer to the basket on defense, which is where he's really excelled at this year averaging 2.3 blocks per game. Putting Horford guarding centers and closer to the basket would also greatly help our rebounding woes by giving Horford a greater chance to succeed in that regard. JJ is also an excellent defender who has the versatility and mobility to guard those out on the perimeter and switch onto guards and other forwards when need be.
This is really a no-brainer at this point. The only downside to this is that it would take JJ's shooting away from a second unit that is pretty barren in that regard right now. However, Olynyk should return within the next the next couple of weeks, so this is a move that should be made for now. I'm a big fan of Amir, but it's time for him to be a bench player full-time now, where I think he'd ultimately succeed. And we should ultimately hope that we either upgrade our frontcourt via a trade or Olynyk clearly proves his ability to be a starter, but for now the best option is to start JJ and play him much more with Horford.