According to NBA.com, if you rank all qualified guards by Efficiency per 48 minutes, Brooks is 77th and Alston is 110th out of 167 players: LINK EFF48 takes away much of the statistical slanting that occurs with EFF alone by eliminating minutes played as a factor. Brooks is also ahead of other reserves like Farmar, Augustin, Dooling, Sergio Rodriguez, Roger Mason, Chris Quinn, Tony Allen, Chalmers, Brevin Knight, Flip Murray, Conley, Bobby Jackson, Eric Gordon, Earl Watson and Daniel Gibson, among others, when it comes to EFF48. Alston is worse than all the aforementioned players. In fact, there isn't a PG with a worse EFF48 that has been starting for his team all season.
Also, out of 75 PGs (according to doug stats) who've played at least 200 minutes this year, Rafer is ranked 60 and Brooks 44 in per-minute NBA EFF.
One way to limit Rafer's shot attempts is to severely limit his mpg. Brooks is young and can log heavy mins.