There are actually a ton of permutations for C's-Nets-Pacers three-way trades, given two assumptions: A) that the Nets are willing to take TA using their TPE, in addition to a couple other small salaries along with Davis, and B) that the C's are willing to take back two players (and about $5m in salary) in the Davis-to-NJ portion of the deal (while sending two+BBD out, so roster-spot neutral).
Most of the possibilities involve the NJ-Bos portion. In most workable scenarios, the deal has to involve two players coming back to Boston, with Yi, Dooling, or Najera being one, and Hayes or Sean Williams being the other (Boone, who Chris mentioned, also works, but I doubt that the Nets would give him up). The C's have to send two of Giddens, Pruitt, and/or Walker along with Davis to make the money work, presumably including Pruitt, since the Nets don't have 4 roster spots available anyway, and they still have to take back TA in a separate TPE deal (which I'll explain later, but the Davis package has to be determined first).
The C's supposedly "need a big" in the combo deal, which means one of 2-3 things: 1) Yi is the primary return, which seems unlikely from NJ's end, 2) Sean Williams qualifies as that big, and is the second salary leaving NJ, and/or 3) Najera counts as a big, and he's the "larger" salary.
If the C's take Dooling/Hayes (the most expensive "column A + column B" combo, but also the only one that doesn't involve any of the three bigs) then Davis has to make $5.2m in year one, and it almost has to be Giddens and Pruitt going to the Nets. If it's Najera and Williams (the cheapest combo) Baby could be paid as little as $3.5m this year. Something in the $4m-$4.5m range seems like market value, though, and something in that range makes any of the non-Dooling/Hayes combos work.
It's even possible for the C's to take two of the $3m-range guys (or even three) but to do that, Scal has to go to NJ along with Davis. If both Scal and Giddens join Davis going the other way, the C's can even take back three guys (Dooling, Najera, and Williams matches BBD at $4m, Scal, and Giddens, and if Baby get $5, and Pruitt is added as well, it could be Dooling, Yi, and Najera, the three "$3m" guys, although that would add nearly $10m to the C's payroll, while sending out less than $4.5, plus Davis, and I can't see that happening; I think Davis/Giddens/Pruitt for one $3m guy and either Hayes or Williams is more likely).
After the initial NJ deal happens, the C's can send TA to the Nets for their TPE, with Daniels joining the C's for anything between $2m and $3.1m.
The Pacers also supposedly "want a wing" in a S&T deal, and that could be any number of guys from NJ. With TA joining the Nets (and probably Giddens as well), CD-R might be considered expendable, and he could be sent to Indy for a conditional 2nd in a "3rd, separate trade" via the minimum trade exception (perhaps even for the same conditional 2nd that the Nets would have to send to Indy along with the TPE for TA).
Or, if Walker is one of the two smaller contracts going to NJ in the Davis S&T, he go to Indy in the "3rd" trade, for that same conditional 2nd.
Finally, if Hayes doesn't come to Boston in the Davis signing, the Nets could also send him to Indy for TA, instead of their TPE. That might actually be the most even salary swap for all three teams, if the Pacers are willing to pay the extra $1.265m, and the C's will accept a Davis S&T that doesn't include Hayes.
As long as Pruitt is one of the bodies to the Nets (or Scal replaces the two smaller-salary guys) all of these combined deals end up being roster-spot neutral for NJ, which is necessary since they currently have 15 guaranteed contracts.
I know that's a ton of possibilities to think about, but they all work under both 125% matching and BYC rules.