Yeah, he joined a 48 win team, 3 seed in the West with a team that mostly kept it's core intact. And Brown has never operated as a coach to just "give" a guy playing time. You have to earn it. Duarte has shown that with his recent surge, after being out of the rotation for like a month. Keon earned that time after his Rockets game.
Sasha has been good, but he hasn't been good to the point of forcing Brown's hand to automatically give him 20 MPG. We can argue about HB all we want, but he's just not going to bench HB in lieu of Sasha. Where do you play him?
Fox 34 || Davion/Keon 14
Duarte 20 || Monk 28
Keegan 32 || Huerter 16
HB 24 || Lyles 16 || Sasha 8?
Domas 34 || Len 14
And this is being generous with Fox/Domas/Keegan minutes. Most competitive games, they're going to be closer to 36+. Right now, Duarte is showing a ton as a defensive role player too; so 20 minutes is probably extremely light for him as well.
People can want Sasha to play, (I do too), but a trade has to happen to open up that time. Or he has to overtake Duarte, basically, to get back into the rotation.