I LOVE Jaylen's potential, but let's face it - he's not really helping the team win. He tends to have 1-2 charging calls a game, and isn't shooting lights out or doing things to significantly help the team win. He's also a poor finisher. Gerald Green, assuming he's healthy enough to go, is a more than adequate fill in for Brown. Now, if Green is also out, there is a decent drop off to James Young.
This is not meant to be a knock on Brown. I think his future is sky-high, but he's a rookie and at this point in time, this is not a huge loss.