Things change. He turned down those offers when he thought OG was a core piece and they might be able to compete with him. This past season showed their experiment of playing all 6’7”+ guys that basically do the same thing isn’t going to work. If they’re focus is more to rebuild around Barnes, the pieces required and cost to gain OG likely changed.
If he’s being traded to GSW, salary wise Poole, Wiggins, or I guess Draymond are the ones that work. You can add picks if you want. The only other thing I see that works salary wise is Moody, Kuminga, GPII.
They probably need a third team involved to get OG to GSW.