Barring injury, these seem like locks for the all star game
G - DeRozan, Irving, Walker, Wall, Beal
F - LBJ, Giannis, Porzingis, Embiid, Simmons
That leaves 2 spots for any other Celtics, along with guys like Drummond, Harris, Lowry, Oladipo, Love, Fournier, Gordon, Dragic, Whiteside, Schroder, etc.
I'm just not sure the coaches will put Horford on the team given who else it out there. The odds of Brown making it are almost 0, especially with him being a guard (only 4 to 6 guards can make the team, while 6 to 8 forwards can). My guess right now is Love and Oladipo are the last 2, but a lot can change before the voting.