Idk what Indiana is thinking. But assuming they don't want to resign Mathurin, this is basically a flyer on JK, where they'd probably resign him to a 1+1 with a player option.

Golden State gets a decent but nothing flashy return. Mathurin and Jackson could simply help replace Kuminga's production, and maybe GS resigns Mathurin this summer, or they use him in a sign-and-trade.