Imo, Kupchak has to use the scouting staff to check who has a chance to become solid all star and try to trade for this kind of player, then trade for an all star (see Washington) but preferably a "decent" contract (Kemba is the star of the team..). Just not at all price.
About Love, Millsap has a 30M team option for next year. For the same amount of money, you have a pf that plays on both end still at an elite level. At worst, he is free agent in 2020 and not necessary ring chasing (i mean vet mini at gsw). And there are other options (i'd rather see Gallinari here, especially because he has a much better offensive game than Marvin and an excellent passer that can make it up for his defense).
Kaminsky will either be traded or Cody. I don't see both staying one more year, and Hernangomez option is low enough to justify to keep him (imo, we will see).
For the fun of it, i added Love & Porter contracts in the projection stuff (again on a 165M basis extension for Kemba). You have like zero flexibility moving forward, yet you have to find a new friendly deal with Lamb and make sure Kemba takes a discount (165M). And that is taking into account you get rid of both Batum and Biyombo.
I made a projection with 'just' the Batum swap with Hill (just so that everyone realize how profitable it would be). Basically if you renounce to Hill (1M according to Spotrac), you write Batum off the books. Then you can work on something nice that won't necessary means geting rid of Biyombo at 'all cost'.
Beal's contract is much more interesting btw (2 more years). Knowing the real deals at sg in next years are probably hart, Harris and alike.


Batum + whatever is needed as picks for Hill works salary wise
Biyombo/Monk for Gallinari works too.
Which would mean moving Marvin for an expiring, ideally (or even work something with the clippers, Biyombo/Monk/Marvin for Gallo/Bradley)