Move #1: Absorb Tiago Splitter with Rondo trade exception.
Move 2: Sign Al Farouq Aminu
Move 3: Trade James Young and Pick 16 to the Hornets for Pick 9 (Willie Cauley Stein)
Move 4: Resign Crowder and let Jarebko/Bass walk (or sign them to very reduced contracts).
Move 5: Unload Wallace and overpay a young free agent.
Bonus: Beyond those moves for the summer, I would almost guarantee that Sullinger is not here this time next year. I think Danny knows that he doesn't fit here long term. If Sullinger is smart, he'll come here in the best shape of his life next year (contract year). I think the trade deadline will offer some major fireworks centering around Sullinger and our bevy of future picks.
Ok, you have some interesting ideas. Let's look at them closely.
#1 - Splitter does offer rim protection. But he doesn't offer much else and his contract isn't exactly friendly with 2 years and $17m to go. Signing him and keeping Wallace (I know, we will get to him) prohibits the Celtics from signing a good free agent this offseason.
We already have one "part time" Center.in Zeller. Assuming that they draft a big man, I'm not sure how there's minutes for Zeller, the rookie and Splitter at the Center spot. Thus for cap reasons and playing time, I'm not a fan of this move. Plus, I think Danny can do much better with that trade exception. He turned the last one into much more and it wasn't worth as much.
If a future 1st (unprotected in 2 years) came along with Splitter? Then maybe - that's the price for freeing up $12m in cap space and taking on a less-than-ideal contract in return.
2. Why would you sign him if you're going to resign Crowder? They play the same position, they're the same age, shoot at similar percentages and Crowder is the better defender. Neither guy should be starting on a good team and Crowder is more valuable off the bench because of his defense. I don't see this as offering much value but taking up precious cap space. Not a fan of this move at all unless Danny is unable to sign Jae (which is unlikely - I think Crowder really wants to come back because he knows he can really contribute here).
3. I would do this in a heartbeat to get WCS. I'm not sure if the Hornets would go for it though.
4. We agree, but resigning Crowder makes your 2nd idea redundant. JJ is a fan favorite and a high energy guy but I don't think he's any kind of real answer for the Celtics. It's time for Bass to go elsewhere. I love his lunch-bucket mentaltiy but he's just not the right fit for this team with what he offers and where the Celtics have needs.
5. Ok, so this one becomes mandatory if you pull the trigger on #1. I'm not a fan of paying someone to take him off our hands considering that this is his final contract year. Wallace may have some value close to the trade deadline if the Celtics need to take on a sizable salary. He's really the largest expiring chunk of salary the Celtics have and that might be needed.
For instance, let's say Ty Lawson, Lance Stephenson, Asik, Pekovic or some other guy is being shopped around. That happens every season and the deal may be attractive to the Celtics. As such, we may very well need that $10m expiring salary to make the deal happen. At worst, the season ends and he comes off the books.
With that in mind, why would Danny want to pay someone to take him off his hands? If he were going to do that, he would have done it already. The only reason is if you need the cap space to sign someone in Free Agency, which the Celtics do not need so long as they don't take on an albatross contract like Splitters. If they do, then Danny has hopefully received that unprotected 1st and therefore offering a couple of 2nds to move Wallace doesn't seem so bad.
So I give you high marks for your imagination and creativity. However, I don't agree with most of your moves. You're giving up some assets that you don't need to give up or getting less on some assets than you should get. I'd be much happier with trading up to get WCS, resigning Crowder and picking up another key free agent (I like Harris from Orlando).