One of the key questions about the original version of the Anthony Davis trade agreed to on June 15 was when it would be completed. Unless the Lakers could wait until July 30 to make the deal using the salary of this year's No. 4 pick, doing so with the players involved would have required them to cut into their cap space to take back Davis' salary.
After the New Orleans Pelicans traded the No. 4 pick on to the Atlanta Hawks, it became clear that those two teams weren't going to wait on the Lakers to get their draft picks signed and playing in the NBA summer league in Las Vegas (which begins July 5).