The whole point of a GM is to put together a roster that is capable of winning a le. Masaii did that, turning a flawed Raps team that got trucked by Lebron into a Juggernaut that is projected to win 61 games and has a 48% chance of winning the finals according to Five-Thirty-Eight.
He didn't want to bring back the same team and also wasn't interested in having DeMar for 3 more years; he got out of that deal, traded the lesser of his three prospects and a pick that was always likely going to be bad. On top of that, he didn't have to take on Gasol or Mills, got an above average starter and also $5 million in cash. Uruji won the trade, either way, enough of this wait a year nonsense.