First to say i don't like Green's personality too, and if Danny decide to not want him it will be because Green will challenge Brad and Brad don't want that
But it does make some sense to swap Brown for Green and go for title now
1.Brown is younger, can develope into better than Green but it also means he is still not there, and Kemba and Hayward are both around 30 and in their prime
2.Championships are never won by 23 years but by veterans in their prime, if you wait for Brown and Tatum it's very possible you come out short and waste Kemba and Hayward's prime
3.You compete for title by Kemba(1)+Hayward(2)+Tatum(3)+Green(4)+Kanter(5)+Smart(6th)
Too many mouth problem solved, even if you fail you will still have Smart in his 30 and Tatum in his 26
4.as long as Brad is the coach and Danny is the GM you don't have to worry about talent incoming while stay competitive, we already know Star Free Agents wants to come here