That's what I'm assuming would be the case.If the 30 pick as any possibility of conveying to WAS, GSW cannot trade 29 and 31 outright. Those must be swaps.
So your point is to get GSW's pick back to them and then we can ask for 4 firsts? I think I prefer owning their draft biased toward super swaps (3 super swaps, 3 picks, 1 swap) since I think that's possible, whereas I don't think they'd consider sending 4 picks and 3 swaps.
My objective in trading a premium asset is maxing the possibility of netting a premium pick by casting the widest, most gapless net.