Grant becomes the starting SF for the Hawks, Lyles takes over Gallinari's backup PF role, and Joseph gives them extra PG depth and his salary for 22-23 wlll offset the $5M buyout the Pistons will have to pay Gallinari.
The Pistons take on Gali's contract (and buyout) to add 2 talented young Forwards in Reddish & Johnson plus land another #1 pick in next years loaded draft.
I also made this trade into a 3 way with the Raptors. Check it out here: https://fanspo.com/nba/s/pistons/trades/hxmv38_eAYpBpJ/grantdragiclyles-to-atl-galinarijoseph-to-tor-hunterjohnsonboucherjohnson1-to-det