I think a Philly trade is likely, but not with DM. I think the more likely trade would be Buddy and Wright for Tobias Harris.
DM would slide right into that the 3rd guard in the rotation.
Boom, the Kings roster is balanced and ready to compete for the playoffs.
I don't think Philly makes any deals until they see what they get for Simmons. That said:
Holmes (if re-signed)
Harris
Barnes
Haliburton
Fox
is a pretty good lineup, though I think Barnes is better suited for the PF spot, as is Harris. You're also paying $56 million for your forwards in Barnes & Harris.
If a deal like this was to go down, I wonder if a trade of Hield and Barnes to PHI for Harris and Thybulle would actually be better for the Kings. It's probably better for the Sixers too, depending on what they get for Simmons.
Either way, Harris' contract is also terrible, even if he's an upgrade on the court.
Now, if you want to trade everybody, this deal also works:
PHI sends: Ben Simmons, Tobias Harris, Matisse Thybulle
PHI receives: De'Aaron Fox, Buddy Hield, Harrison Barnes
SAC sends: De'Aaron Fox, Buddy Hield, Harrison Barnes
SAC receives: Ben Simmons, Tobias Harris, Matisse Thybulle
The salaries are within $1M here.
Holmes
Harris
Simmons
Haliburton
Mitchell
with a bench of Wright, Davis (if resigned), Thybulle, Woodard, and Metu/Quetas