If we don't trade any of our youth for Davis and sign Durant and don't waive Dotson, we'd still have about $36 million left over ($33 with Trier retained). DeAndre will cost in the $5-8m range, same with Vonleh. You can dream a bit bigger than this year's terrible team plus Durant.
Moreover, Durant is coming if he's inheriting the same squad plus RJ Barrett. He needs another potential 2020 all-star to sign. Kyrie, Kemba, Butler, someone else has to be coming with him.
This almost certainly means Vonleh is gone, btw.